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There’s a grassroots organization launching a multi-lingual social networking site today to promote the most important number on the planet.

The number is 350 -- as in parts per million (ppm) of carbon in the atmosphere, the limit of what's acceptable.

And the grassroots group - aptly named 350.org -- is working to embed the number into global consciousness. They're organizing online to have offline results in every corner of the globe, an attempt to redeem the story of the Tower of Babel and unite humanity around a single number.