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350 stands for the number of parts per million of carbon dioxide we can have in our atmosphere without causing irreversible damage - and our atmosphere is already at 385. But Vermont-based environmentalist and author Bill McKibben says not all is doomed if a large grassroots effort starts now to reduce carbon emissions.

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• Bill McKibben, Vermont based environmentalist, author and educator, scholar in residence at Middlebury College, and creator of the nonprofit 350.org