http://www.guardian.co.uk/commentisfree/cifamerica/2011/may/20/climate-change-climate-change-scepticism

For years, in fact, high-level national security officials both inside the Pentagon and in thinktank land have been acknowledging climate change is for real and that we need to take action to preserve and enhance US national security interests. The Pentagon itself stated unequivocally in its February 2010 in its Quadrennial Defence Review Report (pdf), "Climate change and energy are two key issues that will play a significant role in shaping the future security environment." It noted the department of defence is actively "developing policies and plans to manage the effects of climate change on its operating environment, missions and facilities".

CNA Corporation, a nonprofit that conducts research for the Navy and Marines, echoed the Pentagon's urgency, writing, "Climate change, from the Military Advisory Board's perspective, presents significant risks to America's national security." The Army Environmental Policy Institute, the National Intelligence Council and the Centre for a New American Security have issued similar reports on the dangers of runaway climate change and what it could mean for geopolitics.

This isn't a tree-hugging festival. It's the US military and its partners making clear-eyed calculations based on the best available climate science.