Exactly 20 years after warning America about global warming, a top NASA scientist says the situation has got so bad that the world's only hope is drastic action.
James Hansen told US Congress today that the world has long passed the "dangerous level" for greenhouse gases in the atmosphere and needs to get back to 1988 levels.
He said Earth's atmosphere can stay this loaded with man-made carbon dioxide only for a couple more decades without changes such as mass extinction, ecosystem collapse and dramatic sea level rises.
"We're toast if we don't get on a very different path," Hansen, director of the Goddard Institute of Space Sciences, who is sometimes called the godfather of global warming science, told The Associated Press. "This is the last chance."
He's the head of NASA's Goddard Institute of Space Studies. We'd be stupid not to listen.
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