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The field of life extension is broad and ranges from regenerative medicine to disease prevention by nutritional supplements and phytomedicine. Although the relevance of longevity and disease prevention to existential risks is less apparent than the prevention of large-scale catastrophic scenarios, it does have a high relevance to the future of our society. The development of healthy longevity and the efficiency of modern medicine in treating age-related diseases and the question of how well we can handle upcoming issues related to public health will have a major impact on our short-term future in the next few decades. Therefore, the prospect of healthy life extension plays important roles at both a personal and a societal level.
From a personal perspective, a longevity-compatible lifestyle, nutrition and supplementary regimen may not only help us to be active and to live longer, but optimizing our health and fitness also increase our energy, mental performance and capacities for social interaction. This aids our ability to work on the increasingly complex tasks of a 21st-century world that can make a positive impact in society, such as work on existential risk awareness and problem-solving. Recently, I wrote a basic personal orientation on the dietary supplement aspect of basic life extension with an audience of transhumanists, technology advocates with a high future shock level and open-minded scientists in mind, which is available here.
On a societal level, however, aging population and public health issues are serious. A rapid increase of some diseases of civilization, whose prevalence also climbs rapidly with advanced age, is on the march. For example, Type-II-Diabetes is rapidly on its way to becoming an insurmountable problem for China and the WHO projects COPD, the chronic lung disease caused by smoking and pollution, as the third leading cause of death in 2030.
While the currently accelerating increase of diseases of civilization may not collapse society itself, the costs associated with an overaging population could significantly damage societal order, collapse health systems and impact economies given the presently insufficient state of medicine and prevention. The magnitude, urgency and broad spectrum of consequences of age-related diseases of civilization currently being on the march is captured very well in this 5-minute fact-filled presentation on serious upcoming issues of aging in our society today by the LifeStar Foundation. Viewing is highly recommended. In short, a full-blown health crisis appears to be looming over many western countries, including the US, due to the high prevalence of diseases of aging in a growing population. This may require more resources than available if disease prevention efforts are not stepped up as early as possible. In that case, the required urgent action to deal with such a crisis may deprive other technological sectors of time and resources, affecting organizations and governments, including their capacity to manage vital infrastructure, existential risks and planning for a safe and sufficient progress of technology. Hence, not caring about the major upcoming health issue by stepping up disease prevention efforts according to latest biomedical knowledge may indirectly pose challenges affecting our capabilities to handle existential risks.
It should be pointed out that not all measures aimed at improving public health and medicine need to be complex or expensive to attain, as even existing biomedical knowledge is not sufficiently applied. A major example for this is the epidemic Vitamin D deficiency of the western population which was uncovered several years ago. In the last few years, the range of diseases that Vitamin D deficiency and –therapy can influence has grown to include most cancers, diabetes, cardiovascular diseases, brain aging including Alzheimer’s disease and many infectious diseases. Ironically, Vitamin D is one of the cheapest supplements available. Moreover, correcting an existing Vitamin D deficiency, which may affect as much as 80% of western population, may cut mortality risk in half. The related mortality decrease would likely coincide with a reduced morbidity and illness of elderly people, resulting in large savings of public healthcare and hospital funds, since Vitamin D effectively prevents and treats some of the most costly age-related diseases. The Life Extension Foundation, for example, has already offered a free initial supply to the U.S. population and shown that massive healthcare costs (and many lives) could be saved if every hospitalized patient was tested for Vitamin D and/or given the supplement, however this offer was ignored by the US government. This is detailed in an article on the effects of widespread Vitamin D deficiency from the Life Extension Foundation, along with many references for the above health effects of Vitamin D at the end of that article.
To recapitulate, there are plenty of important reasons why the focus on disease prevention and regenerative medicine, by applying existing state-of-the-art biomedical knowledge, as well as advancing key areas such as stem-cell research, rejuvenation technologies and nanomedicine should be an urgent priority for advocates of existential risk management today and during the next few decades.

It would be helpful to discuss these theoretical concepts because there could be significant practical and existential implications.

The Global Brain (GB) is an emergent world-wide entity of distributed intelligence, facilitated by communication and the meaningful interconnections between millions of humans via technology (such as the internet).

For my purposes I take it to mean the expressive integration of all (or the majority) of human brains through technology and communication, a Metasystem Transition from the human brain to a global (Earth) brain. The GB is truly global not only in geographical terms but also in function.

It has been suggested that the GB has clear analogies with the human brain. For example, the basic unit of the human brain (HB) is the neuron, whereas the basic unit of the GB is the human brain. Whilst the HB is space-restricted within our cranium, the GB is constrained within this planet. The HB contains several regions that have specific functions themselves, but are also connected to the whole (e.g. occipital cortex for vision, temporal cortex for auditory function, thalamus etc.). The GB contains several regions that have specific functions themselves, but are connected to the whole (e.g. search engines, governments, etc.).

Some specific analogies are:

1. The Broca’s area in the inferior frontal gyrus, associated with speech. This could be the equivalent of, say, Rubert Murdoch’s communication empire.
2. The motor cortex is the equivalent of the world-wide railway system.
3. The sensory system in the brain is the equivalent of all digital sensors, CCTV network, internet uploading facilities etc.

If we accept that the GB will eventually become fully operational (and this may happen within the next 40–50 years), then there could be severe repercussions on human evolution. Apart from the fact that we could be able to change our genetic make-up using technology (through synthetic biology or nanotechnology for example) there could be new evolutionary pressures that can help extend human lifespan to an indefinite degree.

Empirically, we find that there is a basic underlying law that allows neurons the same lifespan as their human host. If natural laws are universal, then I would expect the same law to operate in similar metasystems, i.e. in my analogy with humans being the basic operating units of the GB. In that case, I ask:

If, there is an axiom positing that individual units (neurons) within a brain must live as long as the brain itself, i.e. 100–120 years, then, the individual units (human brains and, therefore, whole humans) within a GB must live as long as the GB itself, i.e. indefinitely.

Humans will become so embedded and integrated into the GB’s virtual and real structures, that it may make more sense from the allocation of resources point of view, to maintain existing humans indefinitely, rather than eliminate them through ageing and create new ones, who would then need extra resources in order to re-integrate themselves into the GB.

The net result will be that humans will start experiencing an unprecedented prolongation of their lifespan, in an attempt by the GB to evolve to higher levels of complexity at a low thermodynamical cost.

Marios Kyriazis
http://www.elpistheory.info