That's the title of a new story on "climate security" that I wrote for Nature Reports: Climate Change, published today. Climate security has become more than a convenient frame for politicians looking to win support for cap and trade legislation. It's a real concern that military brass around the world are trying to get a handle on. As Wired's Danger Room also reports, the Navy is now taking a pro-active approach to global warming. So whatever happens in Copenhagen or in the U.S. Congress, there's no denying that a strategic shift is afoot in military circles, with respect to climate change.