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Co-founder and director of 350.org Bill McKibben explains why the Keystone XL pipeline will mean "game over" for the climate. (06:39)
Reporters get so desperate they'll even work for a newspaper, and Bill McKibben lowers carbon dioxide levels by not exhaling when he talks. (00:35)
Bill McKibben urges international leaders to take steps to lower the world's carbon dioxide levels through his 350.org movement. (04:33)