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350 Day of Action

350 might be the most important number in the world—which is why people around the world are finding powerful ways to make that number known.
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350 photo essay cover

Prolific author and activist Bill McKibben is on a mission to make 350 the most important number in the world. It represents the uppermost safe parts per million limit of carbon dioxide in Earth's atmosphere—a number he hopes will take center stage at the upcoming climate negotiations in Copenhagen.

People from Africa to Washington, D.C to the Maldives are spreading the word on October 24, with demonstrations on lawns, beaches, snowfields, and even underwater.

To view the photo essay, click here.

Find out more about the most important number in the world at

Interested? 350: The Most Important Number in the World Citizens build a climate movement around a number.


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