The Pentagon is concluding that “global warming is now officially considered a threat to U.S. national security.” In its upcoming 2010 Quadrennial Defense Review, Pentagon planners will report that climate change could result in food and water scarcity, pandemics, population displacement, and other destabilizing events that could create conflict.

“The American people expect the military to plan for the worst,” says retired Vice Adm. Lee Gunn, a 35-year Navy veteran now serving as president of the American Security Project. “It’s that sort of mindset, I think, that has convinced, in my view, the vast majority of military leaders that climate change is a real threat and that the military plays an important role in confronting it.”