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350.org | FossilFreeHealth.org

The number 350 represents the concentration in parts per million of CO2 in the atmosphere that is considered the safe threshold above which climate change is inevitable.

In 2016 we exceeded 400ppm.

The organisation 350.org was founded by Bill Mckibben, who seeded the fossil fuel divestment movement in response to the failure of global climate negotiations in Copenhagen, 2009.