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

Published 10/03 2013 12:47PM

Updated 02/18 2014 07:08AM

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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