CIA
Two years ago, the Central Intelligence Agency announced it was creating a center to analyze the geopolitical ramifications of "phenomena such as desertification, rising sea levels, population shifts and heightened competition for natural resources."

But whatever work the Center on Climate Change and National Security has done remains secret.

In response to National Security Archive scholar Jeffrey Richelson's Freedom of Information Act request, the CIA said all of its work is "classified."

"We completed a thorough search for records responsive to your request and located material that we determined is currently and properly classified and must be denied in its entirety," (.pdf) Susan Viscuso, the agency's information and privacy coordinator, wrote Richelson.

Read the full article on Wired.com