Is Bill McKibben’s math finally adding up? » Bill McKibben address the crowd gathered near the Washington Monument during Sunday’s Forward on Climate rally. (Flickr/Josh Lopez, 350.org)

Bill McKibben address the crowd gathered near the Washington Monument during Sunday’s Forward on Climate rally. (Flickr/Josh Lopez, 350.org)

Bill McKibben address the crowd gathered near the Washington Monument during Sunday’s Forward on Climate rally. (Flickr/Josh Lopez, 350.org)

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