A Brief History of Global Warming

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 warming the planet. 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. (Video by: Alan Jeffries, Christian Capestany, Eric Roston) (Source: Bloomberg)