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McKibben: 350 The Most Important Number

PETERBOROUGH, New Hampshire - The most important number on the planet is 350, according to writer and environmentalist Bill McKibben.

At a Monadnock Summer Lyceum lecture at the Peterborough Unitarian Universalist Church Sunday, McKibben said research has shown 350 parts per million is the amount of carbon dioxide scientists agree is safe to have in our atmosphere. Beyond 350, the human race is in trouble.

As of 2008, we're already over the line at 387, he said.