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State of the Planet: By the Numbers

Renowned environmentalist Bill McKibben takes a look at the Earth's health.
04/23/2013

Transcript for State of the Planet: By the Numbers

If anyone in the world of climate science has the right to say I told you so it may well be -- given. One of the nation's leading environmentalists been given has been -- -- global warming for almost... See More
This transcript has been automatically generated and may not be 100% accurate.
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