Al Gore explains why he’s optimistic about stopping global warming

http://www.washingtonpost.com/blogs/wonkblog/wp/2013/08/21/al-gore-explains-why-hes-optimistic-about-stopping-global-warming/
Al Gore was vice president of the United States from 1993-2001. Since leaving politics, he’s been heavily involved in the campaign to fight global warming, even winning a Nobel Peace Prize for his efforts. And he says he’s more optimistic than ever that the issue has reached “a tipping point.” In this lightly edited interview transcript, he explains why.
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