I should follow up on a piece that I mentioned a few days ago “Now the Pentagon tells Bush: climate change will destroy us,”.
Yes, this was bollox, but here is some details on what happened:

via Future Now blog:
-the purpose of the study was to….
“investigate the “worst-case” possible events, those that are highly unlikely to happen but, if they did happen, would be catastrophic, especially in their impacts on U.S. military operations—“low probability, high impact” events, as they are known in the futurological world….

Unlikely though such events are, such studies are valuable, Schwartz said—as valuable as if, say, someone in the 1990s had investigated the highly unlikely looking possibility that someone would try to destroy the World Trade Center by flying two airplanes into it, he noted….

Unfortunately, the distinction between prediction and highly improbable was muddied by some of the more frantic press coverage.”
Full San Francisco Chronical Article here