Why the name “350.org?”

South Bay Los Angeles 350 Climate Action Group

For most of Earth’s history, our atmosphere has had an average of 275 parts per million (ppm) of carbon dioxide (CO2). CO2 acts like a blanket to trap heat from the sun. The more CO2, the thicker the blanket. According to our nation’s leading climate scientists, including NASA’s Dr. James Hansen, 350 ppm is the maximum amount of CO2 in our atmosphere “to continue civilization as we have known it.”

About 300 years ago, humans started burning fossil fuels like coal and whale oil and the amount of CO2 in the atmosphere started to rise on an increasingly more rapid basis. Unfortunately, our planet’s atmosphere has already leaped past the 350 ppm mark and, today, CO2 levels exceed 400 ppm, increasing by 2 ppm every year.

james-hansen-arrested Dr. James Hansen arrested as part of protest against mountain-top removal coal mining in 2010

Our increased concentrations of CO2 have also increased our…

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