How long have we known about global warming?
From a 1958 documentary by Fritz Capra, "Global Warming - It's NOT newly known"
This is discussed more at length at:
Larry Brilliant: The case for informed optimism
Google.org director Larry Brilliant uses a clip from an old Frank Capra movie to show that we've known about global warming for 50 years -- yet in half a century, we've done almost nothing to solve it. He explores this and other megatrends that could inspire pessimism. But, he says, there is a more powerful case for optimism.
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