The issue of climate security, which a number of experts discussed on this thread, is gaining prominence in U.S. policy and political circles. But as I wrote in this story last November, "a sense of urgency has been building in military and intelligence circles around the world" too. Climate security has also leaped to the top of think tank agendas in the U.S. (see here, here, and here) and in the U.K., where Jeffrey Mazo studies the security and policy implications of climate change at the London-based International Institute for Strategic Studies. Mazo has just published a book, Climate Conflict: How global warming threatens security and what to do about it. In the introduction, he writes: