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Watch Carl Sagan warn that greenhouse gases cause global warming (in 1990!)

Carl Sagan was the featured speaker at the Interparliamentary Conference on the Global Environment in 1990. More than 40 countries met to discuss strategies on key issues on the environment....

Carl Sagan was the featured speaker at the Interparliamentary Conference on the Global Environment in 1990. More than 40 countries met to discuss strategies on key issues on the environment. (Posted by the Film Archives)


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