A Brief History of Global Warming

July 21 — Global warming turns 120 next year… sort of. Next year will be the 120th anniversary of the first time we figured out that human activity could be causing climate change. Since then, the science has gotten firmer and the politics have gotten murkier, but the outlook for the future remains uncertain. This is the history of manmade global warming in three minutes. (Corrects number of hottest years in history since 1998.) (Video by: Alan Jeffries, Christian Capestany, Eric Roston)
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