Why we are 350: Scientists overwhelmingly agree that 350ppm CO2 is the upper limit to sustain life as humans have lived it. For 800,000+ years atmospheric CO2 varied between roughly 180 to 280ppm (graphic).   The numbers: Mauna Loa Observatory
 

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350 Milwaukee, 4142 Newhall St. Shorewood, WI 53211

350.org is a global movement that fights for a just and equitable world by stopping the fossil fuel industry from continuing to destroy our climate.

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