You might want to read a book, if you haven't already, called Climate Wars, by Gwynne Dyer. Basically, it outlines how the British Ministry of Defence, the Pentagon, and NASA have all done serious papers on the dramatic world security problems that are going to be caused by climate change. I would hate it if our departments were not engaged and not behind those other main countries in the world.
On March 11th, 2009. See this statement in context.