Unchained Goddess

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.

http://www.youtube.com/watch?v=W5vka0MRzXs