350.org is an international environmental organization addressing the climate crisis. Its stated goal is to end the use of fossil fuels and transition to renewable energy by building a global, grassroots movement. The 350 in the name stands for 350 parts per million (ppm) of carbon dioxide (CO2), which has been identified as a safe upper limit to avoid a climate tipping point. By the end of 2007, the year 350.org was founded, atmospheric CO2 had already exceeded this threshold, reaching 383 ppm CO2; as of July 2022, the concentration had reached 421 ppm CO2, a level 50% higher than pre-industrial levels. More information...
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