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Did you know that many researchers would like to discover light-catching components in order to convert more of the sun’s power into carbon-free electric power?

A new study reported in the journal Applied Physics Letters in August this year (published by the American Institute of Physics), explains how solar energy could potentially be collected by using oxide materials that have the element selenium. A team at the Lawrence Berkeley National Laboratory in Berkeley, California, embedded selenium in zinc oxide, a relatively affordable material that could make more efficient use of the sun’s power.

The team noticed that even a relatively small amount of selenium, just 9 percent of the mostly zinc-oxide base, significantly enhanced the material’s efficiency in absorbing light.

The main author of this study, Marie Mayer (a fourth-year University of California, Berkeley doctoral student) affirms that photo-electrochemical water splitting, that means using energy from the sun to cleave water into hydrogen and oxygen gases, could potentially be the most fascinating future application for her labor. Managing this reaction is key to the eventual production of zero-emission hydrogen powered motors, which hypothetically will run only on water and sunlight.

Journal Research: Marie A. Mayer et all. Applied Physics Letters, 2010 [link: http://link.aip.org/link/APPLAB/v97/i2/p022104/s1]

The conversion efficiency of a PV cell is the proportion of sunlight energy that the photovoltaic cell converts to electric power. This is very important when discussing Pv products, because improving this efficiency is vital to making Photovoltaic energy competitive with more traditional sources of energy (e.g., fossil fuels).

For comparison, the earliest Photovoltaic products converted about 1%-2% of sunlight energy into electric energy. Today’s Photo voltaic devices convert 7%-17% of light energy into electric energy. Of course, the other side of the equation is the money it costs to produce the PV devices. This has been improved over the decades as well. In fact, today’s PV systems generate electricity at a fraction of the cost of early PV systems.

In the 1990s, when silicon cells were 2 times as thick, efficiencies were much smaller than nowadays and lifetimes were reduced, it may well have cost more energy to make a cell than it could generate in a lifetime. In the meantime, the technological know-how has progressed significantly, and the energy repayment time (defined as the recovery time necessary for generating the energy spent to produce the respective technical energy systems) of a modern photovoltaic module is generally from 1 to 4 years depending on the module type and location.

Usually, thin-film technologies — despite having comparatively low conversion efficiencies — obtain significantly shorter energy repayment times than standard systems (often < 1 year). With a normal lifetime of 20 to 30 years, this means that contemporary photovoltaic cells are net energy producers, i.e. they generate significantly more energy over their lifetime than the energy expended in producing them.

The author — Rosalind Sanders writes for the solar pool cover ratings blog, her personal hobby weblog focused on tips to help home owners to save energy with solar power.

Abstract

J. Storrs Hall’s Weather Machine is a relatively simple nanofabricated machine system with significant consequences in politics and ethics.

After a brief technical description, this essay analyzes the ends, means, and circumstances of a feasible method of controlling the weather, and includes some predictions regarding secondary effects.


Article

When a brilliant person possesses a fertile imagination and significant technical expertise, he or she is likely to imagine world-changing inventions. J. Storrs Hall is the epitome of those geniuses, and his Utility Fog [1] and Space Pier [2] are brilliant engineering designs that will change the world once they are reduced to practice. His most recent invention is the Weather Machine [3], which has been examined by none other than Robert Freitas and found to be technically reasonable—-though Freitas may have found an improved method for climate control that avoids some of the problems discussed below [4].

The Hall Weather Machine is a thin global cloud consisting of small transparent balloons that can be thought of as a programmable and reversible greenhouse gas because it shades or reflects the amount of sunlight that hits the upper stratosphere. These balloons are each between a millimeter and a centimeter in diameter, made of a few-nanometer thick diamondoid membrane. Each balloon is filled with hydrogen to enable it to float at an altitude of 60,000 to 100,000 feet, high above the clouds. It is bisected by an adjustable sheet, and also includes solar cells, a small computer, a GPS receiver to keep track of its location, and an actuator to occasionally (and relatively slowly) move the bisecting membrane between vertical and horizontal orientations. Just like with a regular high-altitude balloon, the heavier control and energy storage systems would be on the bottom of the balloon to automatically set the vertical axis without requiring any energy. The balloon would also have a water vapor/hydrogen generator system for altitude control, giving it the same directional navigation properties that an ordinary hot-air balloon has when it changes altitudes to take advantage of different wind directions at different altitudes.

Four versions of balloons are possible, depending on nature of the bisecting membrane.

  • Version 1. Transparent/Opaque: The bisecting membrane is opaque, and rotates from the horizontal to the vertical in order to control the amount of solar radiation that it allows through (the membrane might be replaced by a immobile liquid crystal that has two basic states: transparent and opaque).
  • Version 2. Emissivity Control: The membrane is white on one side, black on the other. When it is horizontal, either side can be presented upwards; white to scatter the solar radiation into space, black to absorb it into the upper atmosphere.
  • Version 3. Reflection Control: The membrane is black on one side, with a reflective metallic coating on the other. This can direct solar energy in specific directions to increase the effectiveness of solar farms, or to steer hurricanes. Another feature of this version is that it enables the multiple reflection of light from sunlit to dark areas.
  • Version 4. Advanced Photon Control: The balloon would be filled with an aerogel-density metamaterial that could not only control reflectivity via diffraction, but also control the frequency and phase of outgoing photons (with or without stimulated emission). Technically, designing and controlling these kinds of balloons would be a magnitude or two more complex than the earlier versions.

What is impressive about the Weather Machine is that by controlling a tenth of one percent of solar radiation is enough to force global climate in any direction we want. One percent is enough to change regional climate, and ten percent is enough for serious weather control.


The Problems

Every human-designed system has unintended bugs, and may cause negative consequences. That is why we have professional engineering societies, non-profit standards organizations, and government bureaucracies—to help protect the public. There is, therefore, some concern that the Weather Machine will accidentally cause catastrophic weather. However, given the accuracy of weather predictions and global warming models, and the slow movement of masses of air, and the fact that humans are in the loop (and in an emergency, could use a failsafe mode to force all the balloons to drop from the sky), the danger of accidental harm is minimal. At any rate, this article is more concerned with the ethical issues, with accidental unintended consequences to be examined elsewhere.

Many people would be happy to stop global warming, though others (currently living in Siberia or Iceland) might be happier without brutally cold winters. This level of climate control raises some problematic issues that may pit one group of people against another. The intended results could be taken care of the same way we normally take of similar issues in a representative democracy—we vote. This sounds nice, except that we’re not just talking about the United States (or any single nation), but the entire world. And we all know how well the United Nations handles its affairs. Perhaps deciding whether or not we want global warming is a small enough decision that the U.N. can handle it. If not, we can always rely on the world government that evil geniuses want to run, and that conspiracy theorists worry about.

Within the USA, trial lawyers would be especially interested in unintended effects, including trivial ones like rain on parades, or more serious ones like floods and tornadoes. The tremendous inefficiency of this legal nightmare might be meliorated by a “weather tax” that would fund a program to recompense people who are willing to put up with bad weather.

The more advanced versions of balloons are problematic because then the Weather Machine wouldn’t just control the intensity of solar and terrestrial radiation, but could also redirect and concentrate energy. In addition to increasing the effectiveness of solar farms, this would give more powerful and precise control over the weather. Unfortunately, energy concentration is exactly the capability that transforms the Weather Machine into an awesome weapon of mass destruction. Concentrated solar energy has not been used much since 212 BCE [5] when Archimedes used it to set fire the Roman ships that were attacking his city-state of Syracuse. However, the global coordination of the reflective Weather Machine allows bouncing concentrated solar energy around the globe, making it possible to set cities on fire. By fire, I mean the type of fire caused by dropping a nuclear bomb per second for as long as you want. The potential for abuse is rather large.

The most advanced version of the balloon is even better or worse—it contains an aerogel-density (i.e. extremely light and porous) programmable metamaterial that controls the frequency, direction, and phase of the reflected or transmitted radiation. Fully deployed, such a Weather Machine could become a planet-sized telescope—or laser. Small portions of such a system could be used as an effective missile defense system. Configured as a planetary laser, it might be able to defend Earth against stray asteroids such as Apopois, which is due for a flyby in 2029 (and might impact in 2036—especially if some terrorist group places an ion motor on it). Also, a planetary laser could push fairly large rockets rather quickly to Alpha Centari. But if you thought Version 3 was a weapon of mass destruction, Version 4 makes them, and the Transformers look like children’s toys (No wait—that’s what they are ). Optical divergence (currently 1 miliradian for commercially available lasers) will not keep planets from shooting at each other and frying them in their orbits, but the lack of energy density will—unless the balloons can store energy. On the other hand, even primitive laser focusing mechanisms will work fine for lunar infighting.

Given the almost unimaginable weaponization of the Hall Weather Machine, an important reaction is to ask if there any defenses against them. There are two types: those that attack the control algorithms (i.e. cyberware attacks) and those that physically attack the balloons, such as swarms of hunter-killer balloons or larger high-flying “carnivores”. In addition, there are some de-weaponization strategies that will be discussed below.


Ethical Issues

In some ways, ethics is like engineering–solving big problems is most easily done by splitting the problem in to smaller pieces. This means that the best way to determine the ethics of any action (such as building and operating a weather machine) is to determine the ethical considerations of each of the ends, means, and circumstances.

As far as “ends” are concerned, the weather machine passes with flying colors, if nothing else because it can fix global warming (or impending ice ages). Depending on a number of variables, we might even increase the number of nice weekends and increase the biome sizes of certain species.

One counter to these benefits claims that by controlling the weather we would be playing God and that the Weather Machine is equivalent to eating from the Tree of Knowledge of Good and Evil. In my view, if God didn’t like us messing with technology, then He should have let us know a long time ago. At any rate, the Bible doesn’t speak against technology per se. Admittedly, the Bible’s tower of Babel story does condemn the pride and arrogance that may result from technology, but that is another story.

A non-theistic (but just as religious) counter to the main intent of the weather machine is made by deep ecology environmentalists. They often claim that controlling the weather is unnatural, that Mother Nature bats last, or that the very idea of weather control is the reason that the global human population should be reduced to the low millions. These sort of arguments represent metaphysical differences regarding the value of individual human beings and the stewardship role we should have with the environment, and I’m not sure how we can address those issues in a book, much less in 3,500 words or less.

The “means” judges the actual methods used to control the climate and the weather. In this case, modulating the Sun’s energy with many small, high-altitude balloons seems ethically neutral. Even the transformation of a 100 million tons of carbon into diamondoid balloons is ethically neutral (unless one gets the carbon from the living bodies of endangered animals, pre-born fetuses, ethnic minorities, or other humans). By some viewpoints, the sequestering of 100 million tons of atmospheric carbon would be considered virtuous (except that this particular sequestration makes the global warming problem go away, to be possibly replaced by bigger ones).

The ethical analysis leaves “circumstances” as the remaining issue, and here is where things get complicated. Circumstances include things like unintended (especially foreseeable) and secondary consequences, such as whether the means or the end may lead to other evils. In general, a consequentialist argument would likely accept some small risk of some harm, and might accept mechanisms (like lawsuits or something more efficient) to provide feedback to fix any inequities. But this is where things get really complicated.

The first possibility, and most often raised, is that building and operating the Weather Machine might result in severe, unpredictable, unintended consequences. There are a few classes of these consequences, the most obvious centered on out-of-control superstorms or droughts. After all, we aren’t that great at predicting hurricane paths. On the other hand, this is because hurricane paths are inherently unstable—precisely because we don’t have any weather control. If we take a car out to the Bonneville salt flats, tie a car’s steering wheel absolutely straight, and then put a brick on the pedal, we cannot predict whether it will eventually circle left or right. But we allow cars on the road all the time precisely because we have such good feedback and control systems (well, except when they’re getting home late on a Saturday night).

Increased predictability would ameliorate the unintended weather problem, and could be reached by using altitude control (and differently-directed winds) for the balloons to remain over a particular piece of land. Then many tests could be run better predict possible harms and to lower the risk of them ever happening. In general, almost all accidental problems caused by a misbehaving Weather Machine (including computer viruses, rogue controllers, broken balloons, and the environmental toxicology of a million tons of inert diamond falling all over the earth) can be ameliorated by good design, adequate testing, and accurate modeling [6].

Others classes of severe, unintended consequences are secondary effects in the environment, the world economy, politics, and other areas. For example, by successfully moving heat from the tropics to the northern areas, we might turn off the Gulf Stream and other important ocean currents? How will the stock market react to California constantly selling it’s bad weather to Michigan? How will a totalitarian tropical country react if Iceland buys 20% of their neighbors’ sunlight for a much higher price than for theirs?

A second possibility is that the Weather Machine is impossible, and working on it may be a waste of money that could be better spend on more worthwhile projects. Given our knowledge of physics, however, this is unlikely. A caveat is that it will be a race to 2030, when diamond mechanosynthesis should be able to crank out the 100 million tons (the equivalent of 100 miles of freeway) of diamond balloons, and when the worst-case scenarios predict the beginning of serious negative effects of anthropogenic carbon [7]) . Will the Hall Weather Machine be built in time to stop Florida from being inundated by the ocean? The answer depends on when nanosystems will achieve top-down bootstrapping or bottom-up Turing equivalence (which is a technical topic for another time).

A third possibility—if the balloons are not location-controllable—might occur if a nation doesn’t want a foreign nation’s balloons over its territory. The obvious hostile response would be to build hunter-killer balloons to destroy any invaders, as this seems to be permitted by current concepts of sovereignty. Such an arms race could (and probably will) escalate ad infinitum, but open source hardware and software might help prevent it. Any military or intelligence personnel (of any country) would freak at the idea of handing the keys to a weapon of mass destruction to the public, but that may be the only viable solution if the control algorithm works using genetic or market mechanisms — maybe like American Idol or Wikipedia. After all, distributed systems should have distributed control systems. Imagine the balloons controlled by many different radio frequencies with a many different authentication algorithms with open source software. Unfortunately, if such public control is our solution against weather weaponization, we will still need to worry about the “tragedy of commons” and “not in my backyard” secondary effects.

There are other issues of international policy. Suppose we want more sunlight in the Dakotas for growing crops. We could buy it from poor tropical countries, or take it from international ocean territories, where it might affect other countries. Depending on the state of the art and it’s acceleration, but especially at the beginning, it is likely that only rich countries will be able to build Weather Machines. More certainly, only rich countries will be able to fund the early experiments to understand what large numbers of balloons will actually do.

Some might object that knowledge is free and can travel anywhere via the Internet. This is true, but consider the BP disaster. Technical expertise on underwater drilling is international; marine science is international; the disaster receiving tons of press coverage; and yet there is large disagreement within the largely free scientific community about the importance of the spill, how long it will take to clean up, etc. In contrast, connecting a large base of nanofactories to the Internet will enable the global spread of atomically-precise physical devices (such as balloons) in seconds, whether or not the experiments are ever done.

A fourth possibility is that the Weather Machine could be used as a weapon of mass inconvenience—a means of unjust coercion by making possible the threat of bad weather. But the ethics of this application use the same principles as the ethics regarding weapons of mass destruction. I have already pointed out the possible use of the Weather Machine as a weapon—the ethical issues surrounding the more advanced versions of the Weather Machine are basically the same as those concerning weapons of mass destruction, though amplified somewhat by their power (tens of megatons of TNT equivalents per second) and precision of control (+/- one degree Fahrenheit).

Fifth, there is the possibility that psychologically, being in control of the weather is not good for developing character. What if human beings are supposed to cower in their caves when lightning and blizzards strike? After all, that is how we evolved, and there are many things we enjoy that are bad for us [8]. Perhaps having so much control and power over the vicissitudes of life is psychologically bad for us. For evidence, look at the rates of depression in advanced nations.

Finally, what is the cost of not building a Weather Machine? If the cost drops low enough, some nation with the chutzpah will build one. And if they are at all successful, the rest of the world will jump in. But what will the cost be if they design it wrong?

Are the Ethics of the Hall Weather Machine Relevant?

The main problem with thinking about the ethics of the Hall Weather Machine is that by the time we can build 100 million tons of atomically precise anything, controlling the weather is going to be the least of our problems. This is because the nanotechnology revolution will bring about a new set of big, hairy problems—some of which I’ve written about elsewhere [9][10], but I fear that most of them we can’t even imaging yet.

May we live in interesting times!

Tihamer Toth-Fejel, MS
General Dynamics Advanced Information Systems
Michigan Research and Development Center

Acknowledgements

Thanks to James Bach and Chris Dodsworth for valuable contributions.



Footnotes

[1] J. Storrs Hall, Utility Fog: The Stuff that Dreams are Made Of, http://autogeny.org/Ufog.html

[2] J. Storrs Hall, The Space Pier: A hybrid Space-launch Tower concept, http://autogeny.org/tower/tower.html

[3] J. Storrs Hall, The Weather Machine, (transcript from Global Catastrophic Risks 2008 conference, posted by Jeriaska on December 20th, 2008), http://www.acceleratingfuture.com/people-blog/?p=2637

[4] Robert A. Freitas, Diamond Trees (Tropostats): A Molecular Manufacturing Based System for Compositional Atmospheric Homeostasis, 2010 IMM Report 43, 10 February 2010; http://www.imm.org/Reports/rep043.pdf

[5] Before the Christian Era smile

[6] The details will be examined elsewhere (as time permits).

[7] Coincidentally, it is also when the USA Social Security System is supposed to collapse.

[8] “The killer app for medical nanotechnology will be compensating for poor lifestyle choices like overeating and indiscriminate sex—i.e. diabetes II and AIDS” — a grad student at the 2010 Gordon Conference on Nanostructure Fabrication.

[9] T. Toth-Fejel, “Humanity and Nanotechnology”. National Catholic Bioethics Quarterly, V4N2, Summer 2004.

[10] T. Toth-Fejel, “A Few Lesser Implications of Nanofactories: Global Warming is the least of our Problems.” Nanotechnology Perceptions, March 2009.


Paul J. Crutzen

Although this is the scenario we all hope (and work hard) to avoid — the consequences should be of interest to all who are interested in mitigation of the risk of mass extinction:

“WHEN Nobel prize-winning atmospheric chemist Paul Crutzen coined the word Anthropocene around 10 years ago, he gave birth to a powerful idea: that human activity is now affecting the Earth so profoundly that we are entering a new geological epoch.

The Anthropocene has yet to be accepted as a geological time period, but if it is, it may turn out to be the shortest — and the last. It is not hard to imagine the epoch ending just a few hundred years after it started, in an orgy of global warming and overconsumption.

Let’s suppose that happens. Humanity’s ever-expanding footprint on the natural world leads, in two or three hundred years, to ecological collapse and a mass extinction. Without fossil fuels to support agriculture, humanity would be in trouble. “A lot of things have to die, and a lot of those things are going to be people,” says Tony Barnosky, a palaeontologist at the University of California, Berkeley. In this most pessimistic of scenarios, society would collapse, leaving just a few hundred thousand eking out a meagre existence in a new Stone Age.

Whether our species would survive is hard to predict, but what of the fate of the Earth itself? It is often said that when we talk about “saving the planet” we are really talking about saving ourselves: the planet will be just fine without us. But would it? Or would an end-Anthropocene cataclysm damage it so badly that it becomes a sterile wasteland?

The only way to know is to look back into our planet’s past. Neither abrupt global warming nor mass extinction are unique to the present day. The Earth has been here before. So what can we expect this time?”

Read the entire article in New Scientist.

Also read “Climate change: melting ice will trigger wave of natural disasters” in the Guardian about the potential devastating effects of methane hydrates released from melting permafrost in Siberia and from the ocean floor.

For any assembly or structure, whether an isolated bunker or a self sustaining space colony, to be able to function perpetually, the ability to manufacture any of the parts necessary to maintain, or expand, the structure is an obvious necessity. Conventional metal working techniques, consisting of forming, cutting, casting or welding present extreme difficulties in size and complexity that would be difficult to integrate into a self sustaining structure.

Forming requires heavy high powered machinery to press metals into their final desired shapes. Cutting procedures, such as milling and lathing, also require large, heavy, complex machinery, but also waste tremendous amounts of material as large bulk shapes are cut away emerging the final part. Casting metal parts requires a complex mold construction and preparation procedures, not only does a negative mold of the final part need to be constructed, but the mold needs to be prepared, usually by coating in ceramic slurries, before the molten metal is applied. Unless thousands of parts are required, the molds are a waste of energy, resources, and effort. Joining is a flexible process, and usually achieved by welding or brazing and works by melting metal between two fixed parts in order to join them — but the fixed parts present the same manufacturing problems.

Ideally then, in any self sustaining structure, metal parts should be constructed only in the final desired shape but without the need of a mold and very limited need for cutting or joining. In a salient progressive step toward this necessary goal, NASA demonstrates the innovative Electron Beam Free Forming Fabrication (http://www.aeronautics.nasa.gov/electron_beam.htm) Process. A rapid metal fabrication process essentially it “prints” a complex three dimensional object by feeding a molten wire through a computer controlled gun, building the part, layer by layer, and adding metal only where you desire it. It requires no molds and little or no tooling, and material properties are similar to other forming techniques. The complexity of the part is limited only by the imagination of the programmer and the dexterity of the wire feed and heating device.

Electron beam freeform fabrication process in action
Electron beam freeform fabrication process in action

According to NASA materials research engineer Karen Taminger, who is involved in developing the EBF3 process, extensive simulations and modeling by NASA of long duration space flights found no discernable pattern to the types of parts which failed, but the mass of the failed parts remained remarkably consistent throughout the studies done. This is a favorable finding to in-situe parts manufacturing and because of this the EBF³ team at NASA has been developing a desktop version. Taminger writes:

“Electron beam freeform fabrication (EBF³) is a cross-cutting technology for producing structural metal parts…The promise of this technology extends far beyond its applicability to low-cost manufacturing and aircraft structural designs. EBF³ could provide a way for astronauts to fabricate structural spare parts and new tools aboard the International Space Station or on the surface of the moon or Mars”

NASA’s Langley group working on the EBF3 process took their prototype desktop model for a ride on the microgravity simulating NASA flight and found the process works just fine even in micro gravity, or even against gravity.

A structural metal part fabricated from EBF³
A structural metal part fabricated from EBF³

The advantages this system offers are significant. Near net shape parts can be manufactured, significantly reducing scrap parts. Unitized parts can be made — instead of multiple parts that need riveting or bolting, final complex integral structures can be made. An entire spacecraft frame could be ‘printed’ in one sitting. The process also creates minimal waste products and is highly energy and feed stock efficient, critical to self sustaining structures. Metals can be placed only where they are desired and the material and chemistry properties can be tailored through the structure. The technical seminar features a structure with a smooth transitional gradient from one alloy to another. Also, structures can be designed specifically for their intended purposes, without needing to be tailored to manufacturing process, for example, stiffening ridges can be curvilinear, in response to the applied forces, instead of typical grid patterns which facilitate easy conventional manufacturing techniques. Manufactures, such as Sciaky Inc, (http://www.sciaky.com/64.html) are all ready jumping on the process

In combination with similar 3D part ‘printing’ innovations in plastics and other materials, the required complexity for sustaining all the mechanical and structural components of a self sustaining structure is plummeting drastically. Isolated structures could survive on a feed stock of scrap that is perpetually recycled as worn parts are replaced by free form manufacturing and the old ones melted to make new feed stock. Space colonies could combine such manufacturing technologies and scrap feedstock with resource collection creating a viable minimal volume and energy consuming system that could perpetually repair the structure – or even build more. Technologies like these show that the atomic level control that nanotechnology manufacturing proposals offer are not necessary to create self sustaining structure, and that with minor developments of modern technology, self sustaining structures could be built and operated successfully.

May 2: Many U.S. emergency rooms and hospitals crammed with people… ”Walking well” flood hospitals… Clinics double their traffic in major cities … ER rooms turn away EMT cases. — CNN

Update May 4: Confirmed cases of H1N1 virus now at 985 in 20 countries (Mexico: 590, 25 deaths) — WHO. In U.S.: 245 confirmed U.S. cases in 35 states. — CDC.

“We might be entering an Age of Pandemics… a broad array of dangerous emerging 21st-century diseases, man-made or natural, brand-new or old, newly resistant to our current vaccines and antiviral drugs…. Martin Rees bet $1,000 that bioterror or bioerror would unleash a catastrophic event claiming one million lives in the next two decades…. Why? Less forest, more contact with animals… more meat eating (Africans last year consumed nearly 700 million wild animals… numbers of chickens raised for food in China have increased 1,000-fold over the past few decades)… farmers cut down jungle, creating deforested areas that once served as barriers to the zoonotic viruses…” — Larry Brilliant, Wall Street Journal


Jacob Haqq-Misra and Seth D. Baum (2009). The Sustainability Solution to the Fermi Paradox. Journal of the British Interplanetary Society 62: 47–51.

Background: The Fermi Paradox
According to a simple but powerful inference introduced by physicist Enrico Fermi in 1950, we should expect to observe numerous extraterrestrial civilizations throughout our galaxy. Given the old age of our galaxy, Fermi postulated that if the evolution of life and subsequent development of intelligence is common, then extraterrestrial intelligence (ETI) could have colonized the Milky Way several times over by now. Thus, the paradox is: if ETI should be so widespread, where are they? Many solutions have been proposed to account for our absence of ETI observation. Perhaps the occurrence of life or intelligence is rare in the galaxy. Perhaps ETI inevitably destroy themselves soon after developing advanced technology. Perhaps ETI are keeping Earth as a zoo!

The ‘Sustainability Solution’
The Haqq-Misra & Baum paper presents a definitive statement on a plausible but often overlooked solution to the Fermi paradox, which the authors name the “Sustainability Solution”. The Sustainability Solution states: the absence of ETI observation can be explained by the possibility that exponential or other faster-growth is not a sustainable development pattern for intelligent civilizations. Exponential growth is implicit in Fermi’s claim that ETI could quickly expand through the galaxy, an assumption based on observations of human expansion on Earth. However, as we are now learning all too well, our exponential expansion frequently proves unsustainable as we reach the limits of available resources. Likewise, because all civilizations throughout the universe may have limited resources, it is possible that all civilizations face similar issues of sustainability. In other words, unsustainably growing civilizations may inevitably collapse. This possibility is the essence of the Sustainability Solution.

Implications for the Search for Extraterrestrial Intelligence (SETI)
If the Sustainability Solution is true, then we may never observe a galactic-scale ETI civilization, for such an empire would have grown and collapsed too quickly for us to notice. SETI efforts should therefore focus on ETI that grow within the limits of their carrying capacity and thereby avoid collapse. These slower-growth ETI may possess the technological capacity for both radio broadcasts and remote interstellar exploration. Thus, SETI may be more successful if it is expanded to include a search of our Solar System for small, unmanned ETI satellites.

Implications for Human Civilization Management
Does the Sustainability Solution mean that humanity must live sustainably in order to avoid collapse? Not necessarily. Humanity could collapse even if it lives sustainably—for example, if it collides with a large asteroid. Alternatively, humanity may be able to grow rapidly for much longer—for example, until we have colonized the entire Solar System. Finally, the Sustainability Solution is only one of several possible solutions to the Fermi paradox, so it is not necessarily the case that all civilizations must grow sustainably or else face collapse. However, the possibility of the Sustainability Solution makes it more likely that humanity must live more sustainably if it is to avoid collapse.

The projected size of Barack Obama’s “stimulus package” is heading north, from hundreds of billions of dollars into the trillions. And the Obama program comes, of course, on top of the various Bush administration bailouts and commitments, estimated to run as high as $8.5 trillion.

Will this money be put to good use? That’s an important question for the new President, and an even more important question for America. The metric for all government spending ultimately comes down to a single query: What did you get for it?

If such spending was worth it, that’s great. If the country gets victory in war, or victory over economic catastrophe, well, obviously, it was worthwhile. The national interest should never be sacrificed on the altar of a balanced budget.

So let’s hope we get the most value possible for all that money–and all that red ink. Let’s hope we get a more prosperous nation and a cleaner earth. Let’s also hope we get a more secure population and a clear, strategic margin of safety for the United States. Yet how do we do all that?

There’s only one best way: Put space exploration at the center of the new stimulus package. That is, make space the spearhead rationale for the myriad technologies that will provide us with jobs, wealth, and vital knowhow in the future. By boldly going where no (hu)man has gone before, we will change life here on earth for the better.

To put it mildly, space was not high on the national agenda during 2008. But space and rocketry, broadly defined, are as important as ever. As Cold War arms-control theology fades, the practical value of missile defense–against superpowers, also against rogue states, such as Iran, and high-tech terrorist groups, such as Hezbollah and Hamas–becomes increasingly obvious. Clearly Obama agrees; it’s the new President, after all, who will be keeping pro-missile defense Robert Gates on the job at the Pentagon.

The bipartisan reality is that if missile offense is on the rise, then missile defense is surely a good idea. That’s why increasing funding for missile defense engages the attention of leading military powers around the world. And more signs appear, too, that the new administration is in that same strategic defense groove. A January 2 story from Bloomberg News, headlined “Obama Moves to Counter China With Pentagon-NASA Link,” points the way. As reported by Demian McLean, the incoming Obama administration is looking to better coordinate DOD and NASA; that only makes sense: After all, the Pentagon’s space expenditures, $22 billion in fiscal year 2008, are almost a third more than NASA’s. So it’s logical, as well as economical, to streamline the national space effort.

That’s good news, but Obama has the opportunity to do more. Much more.

Throughout history, exploration has been a powerful strategic tool. Both Spain and Portugal turned themselves into superpowers in the 15th and 16th century through overseas expansion. By contrast, China, which at the time had a technological edge over the Iberian states, chose not to explore and was put on the defensive. Ultimately, as we all know, China’s retrograde policies pushed the Middle Kingdom into a half-millennium-long tailspin.

Further, we might consider the enormous advantages that England reaped by colonizing a large portion of the world. Not only did Britain’s empire generate wealth for the homeland, albeit often cruelly, but it also inspired technological development at home. And in the world wars of the 20th century, Britain’s colonies, past and present, gave the mother country the “strategic depth” it needed for victory.

For their part, the Chinese seem to have absorbed these geostrategic lessons. They are determined now to be big players in space, as a matter of national grand strategy, independent of economic cycles. In 2003, the People’s Republic of China powered its first man into space, becoming only the third country to do so. And then, more ominously, in 2007, China shot down one of their own weather satellites, just to prove that they had robust satellite-killing capacity.

Thus the US and all the other space powers are on notice: In any possible war, the Chinese have the capacity to “blind” our satellites. And now they plan to put a man on the moon in the next decade. “The moon landing is an extremely challenging and sophisticated task,” declared Wang Zhaoyao, a spokesman for China’s space program, in September, “and it is also a strategically important technological field.”

India, the other emerging Asian superpower, is paying close attention to its rival across the Himalayas. Back in June, The Washington Times ran this thought-provoking headline: “China, India hasten arms race in space/U.S. dominance challenged.” According to the Times report, India, possessor of an extensive civilian satellite program, means to keep up with emerging space threats from China, by any means necessary. Army Chief of Staff Gen. Deepak Kapoor said that his country must “optimize space applications for military purposes,” adding, “the Chinese space program is expanding at an exponentially rapid pace in both offensive and defensive content.” In other words, India, like every other country, must compete–because the dangerous competition is there, like it or not.

India and China have fought wars in the past; they obviously see “milspace” as another potential theater of operations. And of course, Japan, Russia, Brazil, and the European Union all have their own space programs.

Space exploration, despite all the bonhomie about scientific and economic benefit for the common good, has always been driven by strategic competition. Beyond mere macho “bragging rights” about being first, countries have understood that controlling the high ground, or the high frontier, is a vital military imperative. So we, as a nation, might further consider the value of space surveillance and missile defense. It’s hard to imagine any permanent peace deal in the Middle East, for example, that does not include, as an additional safeguard, a significant commitment to missile and rocket defense, overseen by impervious space satellites. So if the U.S. and Israel, for example, aren’t there yet, well, they need to get there.

Americans, who have often hoped that space would be a demilitarized preserve for peaceful cooperation, need to understand that space, populated by humans and their machines, will be no different from earth, populated by humans and their machines. That is, every virtue, and every evil, that is evident down here will also be evident up there. If there have been, and will continue to be, arms races on earth, then there will be arms races in space. As we have seen, other countries are moving into space in a big way–and they will continue to do so, whether or not the U.S. participates.

Meanwhile, in the nearer term, if the Bush administration’s “forward strategy of freedom”–the neoconservative idea that we would make America safe by transforming the rest of the world–is no longer an operative policy, then we will, inevitably, fall back on “defense” as the key idea for making America safe.

But in the short run, of course, the dominant issue is the economy. Aside from the sometimes inconvenient reality that national defense must always come first, the historical record shows that high-tech space work is good for the economy; the list of spinoffs from NASA, spanning the last half-century, is long and lucrative.

Moreover, a great way to guarantee that the bailout/stimulus money is well spent is to link it to a specific goal–a goal which will in turn impose discipline on the spenders. During the New Deal, for example, there were many accusations of malfeasance against FDR’s “alphabet soup” of agencies, and yet the tangible reality, in the 30s, was that things were actually getting done. Jobs were created, and, just as more important, enduring projects were being built; from post offices to Hoover Dam to the Tennessee Valley Authority, America was transformed.

Even into the 50s and 60s, the federal government was spending money on ambitious and successful projects. The space program was one, but so was the interstate highway program, as well as that new government startup, ARPANET.

Indeed, it could be argued that one reason the federal government has grown less competent and more flabby over the last 30 years is the relative lack of “hard” Hamiltonian programs–that is, nuts and bolts, cement and circuitry–to provide a sense of bottom-line rigor to the spending process.

And so, for example, if America were to succeed in building a space elevator–in its essence a 22,000-mile cable, operating like a pulley, dangling down from a stationary satellite, a concept first put forth in the late 19th century–that would be a major driver for economic growth. Japan has plans for just such a space elevator; aren’t we getting a little tired of losing high-tech economic competitions to the Japanese?

So a robust space program would not only help protect America; it would also strengthen our technological economy.

But there’s more. In the long run, space spending would be good for the environment. Here’s why:

History, as well as common sense, tells us that the overall environmental footprint of the human race rises alongside wealth. That’s why, for example, the average American produces five times as much carbon dioxide per year as the average person dwelling anywhere else on earth. Even homeless Americans, according to an MIT study–and even the most scrupulously green Americans–produce twice as much CO2, per person, as the rest of the world. Around the planet, per capita carbon dioxide emissions closely track per capita income.

A holistic understanding of homo sapiens in his environment will acknowledge the stubbornly acquisitive and accretive reality of human nature. And so a truly enlightened environmental policy will acknowledge another blunt reality: that if the carrying capacity of the earth is finite, then it makes sense, ultimately, to move some of the population of the earth elsewhere–into the infinity of space.

The ZPG and NPG advocates have their own ideas, of course, but they don’t seem to be popular in America, let alone the world. But in the no-limits infinity of space, there is plenty of room for diversity and political experimentation in the final frontier, just as there were multiple opportunities in centuries past in the New World. The main variable is developing space-traveling capacity to get up there–to the moon, Mars, and beyond–to see what’s possible.

Instead, the ultimately workable environmental plan–the ultimate vision for preserving the flora, the fauna, and the ice caps–is to move people, and their pollution, off this earth.

Indeed, space travel is surely the ultimate plan for the survival of our species, too. Eventually, through runaway WMD, or runaway pollution, or a stray asteroid, or some Murphy-esque piece of bad luck, we will learn that our dominion over this planet is fleeting. That’s when we will discover the grim true meaning of Fermi’s Paradox.

In various ways, humankind has always anticipated apocalypse. And so from Noah’s Ark to “Silent Running” to “Wall*E,” we have envisioned ways for us and all other creatures, great and small, to survive. The space program, stutteringly nascent as it might be, can be seen as a slow-groping understanding that lifeboat-style compartmentalization, on earth and in the heavens, is the key to species survival. It’s a Darwinian fitness test that we ought not to flunk.

Barack Obama, who has blazed so many trails in his life, can blaze still more, including a track to space, over the far horizon of the future. In so doing, he would be keeping faith with a figure that he in many ways resembles, John F. Kennedy. It was the 35th President who declared that not only would America go to the moon, but that we would lead the world into space.

As JFK put it so ringingly back in 1962:

The vows of this Nation can only be fulfilled if we in this Nation are first, and, therefore, we intend to be first. In short, our leadership in science and in industry, our hopes for peace and security, our obligations to ourselves as well as others, all require us to make this effort, to solve these mysteries, to solve them for the good of all men, and to become the world’s leading space-faring nation.

Today the 44th President must spend a lot of money to restore our prosperity, but he must spend it wisely. He must also keep America secure against encroaching threats, even as he must improve the environment in the face of a burgeoning global economy.

Accomplishing all these tasks is possible, but not easy. Yes, of course he will need new ideas, but he will also need familiar and proven ideas. One of the best is fostering and deploying profound new technology in pursuit of expansion and exploration.

The stars, one might hope, are aligning for just such a rendezvous with destiny.

Here I would like to suggest readers a quotation from my book “Structure of the global catastrophe” (http://www.scribd.com/doc/7529531/-) there I discuss problems of preventing catastrophes.

Refuges and bunkers

Different sort of a refuge and bunkers can increase chances of survival of the mankind in case of global catastrophe, however the situation with them is not simple. Separate independent refuges can exist for decades, but the more they are independent and long-time, the more efforts are necessary for their preparation in advance. Refuges should provide ability for the mankind to the further self-reproduction. Hence, they should contain not only enough of capable to reproduction people, but also a stock of technologies which will allow to survive and breed in territory which is planned to render habitable after an exit from the refuge. The more this territory will be polluted, the higher level of technologies is required for a reliable survival.
Very big bunker will appear capable to continue in itself development of technologies and after catastrophe. However in this case it will be vulnerable to the same risks, as all terrestrial civilisation — there can be internal terrorists, AI, nanorobots, leaks etc. If the bunker is not capable to continue itself development of technologies it, more likely, is doomed to degradation.
Further, the bunker can be or «civilizational», that is keep the majority of cultural and technological achievements of the civilisation, or “specific”, that is keep only human life. For “long” bunkers (which are prepared for long-term stay) the problem of formation and education of children and risks of degradation will rise. The bunker can or live for the account of the resources which have been saved up before catastrophe, or be engaged in own manufacture. In last case it will be simply underground civilisation on the infected planet.
The more a bunker is constructed on modern technologies and independent cultural and technically, the higher ammount of people should live there (but in the future it will be not so: the bunker on the basis of advanced nanotechnology can be even at all deserted, — only with the frozen human embryos). To provide simple reproduction by means of training to the basic human trades, thousand people are required. These people should be selected and be in the bunker before final catastrophe, and, it is desirable, on a constant basis. However it is improbable, that thousand intellectually and physically excellent people would want to sit in the bunker “just in case”. In this case they can be in the bunker in two or three changes and receive for it a salary. (Now in Russia begins experiment «Mars 500» in which 6 humans will be in completely independent — on water, to meal, air — for 500 days. Possibly, it is the best result which we now have. In the early nineties in the USA there was also a project «Biosphera-2» in which people should live two years on full self-maintenance under a dome in desert. The project has ended with partial failure as oxygen level in system began to fall because of unforeseen reproduction of microorganisms and insects.) As additional risk for bunkers it is necessary to note fact of psychology of the small groups closed in one premise widely known on the Antarctic expeditions — namely, the increase of animosities fraught with destructive actions, reducing survival rate.
The bunker can be either unique, or one of many. In the first case it is vulnerable to different catastrophes, and in the second is possible struggle between different bunkers for the resources which have remained outside. Or is possible war continuation if catastrophe has resulted from war.
The bunker, most likely, will be either underground, or in the sea, or in space. But the space bunker too can be underground of asteroids or the Moon. For the space bunker it will be more difficult to use the rests of resources on the Earth. The bunker can be completely isolated, or to allow “excursion” in the external hostile environment.
As model of the sea bunker can serve the nuclear submarine possessing high reserve, autonomy, manoeuvrability and stability to negative influences. Besides, it can easily be cooled at ocean (the problem of cooling of the underground closed bunkers is not simple), to extract from it water, oxygen and even food. Besides, already there are ready boats and technical decisions. The boat is capable to sustain shock and radiating influence. However the resource of independent swimming of modern submarines makes at the best 1 year, and in them there is no place for storage of stocks.
Modern space station ISS could support independently life of several humans within approximately year though there are problems of independent landing and adaptation. Not clearly, whether the certain dangerous agent, capable to get into all cracks on the Earth could dissipate for so short term.
There is a difference between gaso — and bio — refuges which can be on a surface, but are divided into many sections for maintenance of a mode of quarantine, and refuges which are intended as a shelter from in the slightest degree intelligent opponent (including other people who did not manage to get a place in a refuge). In case of biodanger island with rigid quarantine can be a refuge if illness is not transferred by air.
A bunker can possess different vulnerabilities. For example, in case of biological threat, is enough insignificant penetration to destroy it. Only hi-tech bunker can be the completely independent. Energy and oxygen are necessary to the bunker. The system on a nuclear reactor can give energy, but modern machines hardly can possess durability more than 30–50 years. The bunker cannot be universal — it should assume protection against the certain kinds of threats known in advance — radiating, biological etc.
The more reinforced is a bunker, the smaller number of bunkers can prepare mankind in advance, and it will be more difficult to hide such bunker. If after a certain catastrophe there was a limited number of the bunkers which site is known, the secondary nuclear war can terminate mankind through countable number of strikes in known places.
The larger is the bunker, the less amount of such bunkers is possible to construct. However any bunker is vulnerable to accidental destruction or contamination. Therefore the limited number of bunkers with certain probability of contamination unequivocally defines the maximum survival time of mankind. If bunkers are connected among themselves by trade and other material distribution, contamination between them is more probable. If bunkers are not connected, they will degrade faster. The more powerfully and more expensively is the bunker, the more difficult is to create it imperceptibly for the probable opponent and so it easeir becomes the goal for an attack. The more cheaply the bunker, the less it is durable.
Casual shelters — the people who have escaped in the underground, mines, submarines — are possible. They will suffer from absence of the central power and struggle for resources. The people, in case of exhaustion of resources in one bunker, can undertake the armed attempts to break in other next bunker. Also the people who have escaped casually (or under the threat of the comong catastrophe), can attack those who was locked in the bunker.
Bunkers will suffer from necessity of an exchange of heat, energy, water and air with an external world. The more independent is the bunker, the less time it can exist in full isolation. Bunkers being in the Earth will deeply suffer from an overheating. Any nuclear reactors and other complex machines will demand external cooling. Cooling by external water will unmask them, and it is impossible to have energy sources lost-free in the form of heat, while on depth of earth there are always high temperatures. Temperature growth, in process of deepening in the Earth, limits depth of possible bunkers. (The geothermal gradient on the average makes 30 degrees C/kilometers. It means, that bunkers on depth more than 1 kilometre are impossible — or demand huge cooling installations on a surface, as gold mines in the republic of South Africa. There can be deeper bunkers in ices of Antarctica.)
The more durable, more universal and more effective, should be a bunker, the earlier it is necessary to start to build it. But in this case it is difficult to foresee the future risks. For example, in 1930th years in Russia was constructed many anti-gase bombproof shelters which have appeared useless and vulnerable to bombardments by heavy demolition bombs.
Efficiency of the bunker which can create the civilisation, corresponds to a technological level of development of this civilisation. But it means that it possesses and corresponding means of destruction. So, especially powerful bunker is necessary. The more independently and more absolutely is the bunker (for example, equipped with AI, nanorobots and biotechnologies), the easier it can do without, eventually, people, having given rise to purely computer civilisation.
People from different bunkers will compete for that who first leaves on a surface and who, accordingly, will own it — therefore will develop the temptation for them to go out to still infected sites of the Earth.
There are possible automatic robotic bunkers: in them the frozen human embryos are stored in a certain artificial uterus and through hundreds or thousand years start to be grown up. (Technology of cryonics of embryos already exists, and works on an artificial uterus are forbidden for bioethics reasons, but basically such device is possible.) With embryos it is possible to send such installations in travel to other planets. However, if such bunkers are possible, the Earth hardly remains empty — most likely it will be populated with robots. Besides, if the human cub who has been brought up by wolves, considers itself as a wolf as whom human who has been brought up by robots will consider itself?
So, the idea about a survival in bunkers contains many reefs which reduce its utility and probability of success. It is necessary to build long-term bunkers for many years, but they can become outdated for this time as the situation will change and it is not known to what to prepare. Probably, that there is a number of powerful bunkers which have been constructed in days of cold war. A limit of modern technical possibilities the bunker of an order of a 30-year-old autonomy, however it would take long time for building — decade, and it will demand billions dollars of investments.
Independently there are information bunkers, which are intended to inform to the possible escaped descendants about our knowledge, technologies and achievements. For example, in Norway, on Spitsbergen have been created a stock of samples of seeds and grain with these purposes (Doomsday Vault). Variants with preservation of a genetic variety of people by means of the frozen sperm are possible. Digital carriers steady against long storage, for example, compact discs on which the text which can be read through a magnifier is etched are discussed and implemented by Long Now Foundation. This knowledge can be crucial for not repeating our errors.

(Hat Tip: IsraGood)

Garbage. No matter where you go or how far you travel, it seems that every society has a means of acquiring it and dumping it in vast landfills–a fitting tribute towards humanities pursuit of a better future.

While recycling and “reducing” can help diminish the amount that goes into these trash havens, it may not be enough to counter the vast amount people throw away everyday.

Since convincing people to throw away less is a never ending battle (especially in this day and age), why not instead turn these “mountains” of garbage into energy?

(Israel 21st Century) There may be gold, or at least electricity, in those dumps. So says Jean Claude Ohayon, CEO of Israeli startup TGE Tech, which has developed and patented a system whereby unrecycled refuse can be converted into fuel with a special patented device that turns garbage into gas — syngas, a well-known element that has some of the properties of gas, oil and coal. […]

But with the TGE system, “the trash is turned into syngas, which can be burned for fuel like any other material. The trash is gone, and in its place is electricity, which can then be used to supply power to a whole neighborhood or small city,” says Ohayon.

Syngas is not as effective as oil or coal, Ohayon realizes; it only has about 15% of the calorie (energy) power of its authentic siblings. However, Ohayon explains, that level of energy is more than enough to power the gasifier, the waste treatment plant, and probably all the streetlights and traffic lights in a city on any particular day.

“One ton of garbage can generate 0.4 kilowatts of electricity an hour, which isn’t a huge amount, but can definitely contribute somewhat to the energy pool in a locality,” he says. And at the same time — the garbage is gone.

If humanity chooses to remain on planet Earth (as opposed to conquering the final frontier) then they will need to find a way to deal with the massive amounts of garbage we “enjoy” creating.

By turning these heaps into fuel, our species could find a semi-lucrative way of not only getting rid of these trash havens, but perhaps easing the burden of energy as well.

Hopefully more cities will consider what TGE Tech (and similar companies) have to offer, as the less we have on planet Earth, the greener the future will be for the upcoming generation.

Cross posted from Nextbigfuture

Click for larger image

I had previously looked at making two large concrete or nanomaterial monolithic or geodesic domes over cities which could protect a city from nuclear bombs.

Now Alexander Bolonkin has come up with a cheaper, technological easy and more practical approach with thin film inflatable domes. It not only would provide protection form nuclear devices it could be used to place high communication devices, windmill power and a lot of other money generating uses. The film mass covered of 1 km**2 of ground area is M1 = 2×10**6 mc = 600 tons/km**2 and film cost is $60,000/km**2.
The area of big city diameter 20 km is 314 km**2. Area of semi-spherical dome is 628 km2. The cost of Dome cover is 62.8 millions $US. We can take less the overpressure (p = 0.001atm) and decrease the cover cost in 5 – 7 times. The total cost of installation is about 30–90 million $US. Not only is it only about $153 million to protect a city it is cheaper than a geosynchronous satellite for high speed communications. Alexander Bolonkin’s website

The author suggests a cheap closed AB-Dome which protects the densely populated cities from nuclear, chemical, biological weapon (bombs) delivered by warheads, strategic missiles, rockets, and various incarnations of aviation technology. The offered AB-Dome is also very useful in peacetime because it shields a city from exterior weather and creates a fine climate within the ABDome. The hemispherical AB-Dome is the inflatable, thin transparent film, located at altitude up to as much as 15 km, which converts the city into a closed-loop system. The film may be armored the stones which destroy the rockets and nuclear warhead. AB-Dome protects the city in case the World nuclear war and total poisoning the Earth’s atmosphere by radioactive fallout (gases and dust). Construction of the AB-Dome is easy; the enclosure’s film is spread upon the ground, the air pump is turned on, and the cover rises to its planned altitude and supported by a small air overpressure. The offered method is cheaper by thousand times than protection of city by current antirocket systems. The AB-Dome may be also used (height up to 15 and more kilometers) for TV, communication, telescope, long distance location, tourism, high placed windmills (energy), illumination and entertainments. The author developed theory of AB-Dome, made estimation, computation and computed a typical project.

His idea is a thin dome covering a city with that is a very transparent film 2 (Fig.1). The film has thickness 0.05 – 0.3 mm. One is located at high altitude (5 — 20 km). The film is supported at this altitude by a small additional air pressure produced by ground ventilators. That is connected to Earth’s ground by managed cables 3. The film may have a controlled transparency option. The system can have the second lower film 6 with controlled reflectivity, a further option.

The offered protection defends in the following way. The smallest space warhead has a
minimum cross-section area 1 m2 and a huge speed 3 – 5 km/s. The warhead gets a blow and overload from film (mass about 0.5 kg). This overload is 500 – 1500g and destroys the warhead (see computation below). Warhead also gets an overpowering blow from 2 −5 (every mass is 0.5 — 1 kg) of the strong stones. Relative (about warhead) kinetic energy of every stone is about 8 millions of Joules! (It is in 2–3 more than energy of 1 kg explosive!). The film destroys the high speed warhead (aircraft, bomber, wing missile) especially if the film will be armored by stone.

Our dome cover (film) has 2 layers: top transparant layer 2, located at a maximum altitude (up 5 −20 km), and lower transparant layer 4 having control reflectivity, located at altitude of 1–3 km (option). Upper transparant cover has thickness about 0.05 – 0.3 mm and supports the protection strong stones (rebbles) 8. The stones have a mass 0.2 – 1 kg and locate the step about 0.5 m.

If we want to control temperature in city, the top film must have some layers: transparant dielectric layer, conducting layer (about 1 — 3 microns), liquid crystal layer (about 10 — 100 microns), conducting layer (for example, SnO2), and transparant dielectric layer. Common thickness is 0.05 — 0.5 mm. Control voltage is 5 — 10 V. This film may be produced by industry relatively cheaply.

If some level of light control is needed materials can be incorporated to control transparency. Also, some transparent solar cells can be used to gather wide area solar power.


As you see the 10 kt bomb exploded at altitude 10 km decreases the air blast effect about in 1000
times and thermal radiation effect without the second cover film in 500 times, with the second reflected film about 5000 times. The hydrogen 100kt bomb exploded at altitude 10 km decreases the air blast effect about in 10 times and thermal radiation effect without the second cover film in 20 times, with the second reflected film about 200 times. Only power 1000kt thermonuclear (hydrogen) bomb can damage city. But this damage will be in 10 times less from air blast and in 10 times less from thermal radiation. If the film located at altitude 15 km, the
damage will be in 85 times less from the air blast and in 65 times less from the thermal radiation.
For protection from super thermonuclear (hydrogen) bomb we need in higher dome altitudes (20−30 km and more). We can cover by AB-Dome the important large region and full country.

Because the Dome is light weight it could be to stay in place even with very large holes. Multiple shells of domes could still be made for more protection.

Better climate inside a dome can make for more productive farming.

AB-Dome is cheaper in hundreds times then current anti-rocket systems.
2. AB-Dome does not need in high technology and can build by poor country.
3. It is easy for building.
4. Dome is used in peacetime; it creates the fine climate (weather) into Dome.
5. AB-Dome protects from nuclear, chemical, biological weapon.
6. Dome produces the autonomous existence of the city population after total World nuclear war
and total confinement (infection) all planet and its atmosphere.
7. Dome may be used for high region TV, for communication, for long distance locator, for
astronomy (telescope).
8. Dome may be used for high altitude tourism.
9. Dome may be used for the high altitude windmills (getting of cheap renewable wind energy).
10. Dome may be used for a night illumination and entertainment