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Bill McKibben urges international leaders to take steps to lower the world's carbon dioxide levels through his 350.org movement.
Reporters get so desperate they'll even work for a newspaper, and Bill McKibben lowers carbon dioxide levels by not exhaling when he talks.
Co-founder and director of 350.org Bill McKibben explains why the Keystone XL pipeline will mean 'game over' for the climate.
The government cracks down on woodworking, Jimmy Fallon's ice cream war with Stephen heats up, and Bill McKibben discusses global warming.