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From Popular Science, a project that introduces a powerful kinetic weapon to the U.S. military arsenal:

When the order comes, the sub shoots a 65-ton Trident II ballistic missile into the sky. Within 2 minutes, the missile is traveling at more than 20,000 ft. per second. Up and over the oceans and out of the atmosphere it soars for thousands of miles. At the top of its parabola, hanging in space, the Trident’s four warheads separate and begin their screaming descent down toward the planet. Traveling as fast as 13,000 mph, the warheads are filled with scored tungsten rods with twice the strength of steel. Just above the target, the warheads detonate, showering the area with thousands of rods-each one up to 12 times as destructive as a .50-caliber bullet. Anything within 3000 sq. ft. of this whirling, metallic storm is obliterated.

If Pentagon strategists get their way, there will be no place on the planet to hide from such an assault. The plan is part of a program — in slow development since the 1990s, and now quickly coalescing in military circles — called Prompt Global Strike. It will begin with modified Tridents. But eventually, Prompt Global Strike could encompass new generations of aircraft and armaments five times faster than anything in the current American arsenal. One candidate: the X-51 hypersonic cruise missile, which is designed to hit Mach 5 — roughly 3600 mph. The goal, according to the U.S. Strategic Command’s deputy commander Lt. Gen. C. Robert Kehler, is “to strike virtually anywhere on the face of the Earth within 60 minutes.”

The question is whether such an attack can be deployed without triggering World War III: Those tungsten-armed Tridents look, and fly, exactly like the deadliest weapons in the American nuclear arsenal.

The article goes on to list concerns that were brought up by officials in congress and elsewhere — what is it really good for? If the President is going to authorize an ICBM launch, he’d better have a damn good reason to do so. But the need to use a cruise missile implies inaccessability by air. If the target is inaccessible by air, then is the intelligence leading to its selection really that trustworthy? Because this weapon looks like a nuclear missile, it probably has the potential to cause more problems than it solves.

From Eurekalert, a warning about the dangers of nuclear war:

Even a small-scale, regional nuclear war could produce as many direct fatalities as all of World War II and disrupt the global climate for a decade or more, with environmental effects that could be devastating for everyone on Earth, university researchers have found.

These powerful conclusions are being presented Dec. 11 during a press conference and a special technical session at the annual meeting of American Geophysical Union in San Francisco. The research also appears in twin papers posted on Atmospheric Chemistry and Physics Discussions, an online journal.

A team of scientists at Rutgers, The State University of New Jersey; the University of Colorado at Boulder (CU-Boulder); and UCLA conducted the rigorous scientific studies reported.

Against the backdrop of growing tensions in the Middle East and nuclear “saber rattling” elsewhere in Asia, the authors point out that even the smallest nuclear powers today and in the near future may have as many as 50 or more Hiroshima-size (15 kiloton) weapons in their arsenals; all told, about 40 countries possess enough plutonium and/or uranium to construct substantial nuclear arsenals.

Owen “Brian” Toon, chair of the department of atmospheric and oceanic sciences and a member of the Laboratory for Atmospheric and Space Physics at CU-Boulder, oversaw the analysis of potential fatalities based on an assessment of current nuclear weapons inventories and population densities in large urban complexes. His team focused on scenarios of smoke emissions that urban firestorms could produce.

“The results described in one of the new papers represent the first comprehensive quantitative study of the consequences of a nuclear conflict between smaller nuclear states,” said Toon and his co-authors. “A small country is likely to direct its weapons against population centers to maximize damage and achieve the greatest advantage,” Toon said. Fatality estimates for a plausible regional conflict ranged from 2.6 million to 16.7 million per country.

So it does look like global cooling from soot emitted by nuclear firestorms really is a big problem. All countries should suspend any research towards nuclear weapons, and countries like the United States should openly state that they will withhold from using nuclear weapons during specific engagements.