In October 2003, a little-known think tank in the Department of Defense quietly released a report warning that climate change could happen suddenly — so suddenly it could pose a major threat to our country's national security. The title of the Pentagon report was a mouthful: An Abrupt Climate Change Scenario and its Implications for United States National Security. Those implications included rising seas, flooded coastal cities, at least one drowned country, droughts, food shortages, failed states and fortress states. The report was never designed as a scientific prediction. It was a speculative effort by defense strategists to dramatize all the security threats the country would face if the climate suddenly shifted. Why was the Pentagon suddenly worried about abrupt climate change? Because new evidence from Greenland showed it had happened before.   more . . .