Scientist on Warming: "We're Toast"

James Hansen, director of NASA's Goddard Institute for Space Studies, has been warning the US government about global warming for 20 years. Now the CO2 levels in the atmosphere have gotten so high that "we're toast if we don't get on a very different path," he told Congress yesterday.

When Hansen first testified to Congress about global warming, it was 1988 and a heat wave was sweeping across the East Coast. That year was the hottest year on record for DC, but fourteen of the 20 subsequent years have been even hotter. By his estimations, the Arctic will be completely ice-free by the summer of 2018. "The Arctic is the first tipping point and it's occuring exactly the way we said it would," he told senators. "This is the last chance."