NASA warming scientist: 'This is the last chance'

(AP) -- Exactly 20 years after warning America about global warming, a top NASA scientist said the situation has gotten so bad that the world's only hope is drastic action.

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<p><a href="http://www.physorg.com/news133495748.html">NASA warming scientist: 'This is the last chance'</a></p> <p>(AP) -- Exactly 20 years after warning America about global warming, a top NASA scientist said the situation has gotten so bad that the world's only hope is drastic action.</p>