350.org
350.org: international environmental NGO (created in 2008) asking to reduce the amount of CO2 in the atmosphere from current levels to below 350 ppm (parts per million), the safe level of carbon dioxide.
350?
“If humanity wishes to preserve a planet similar to that on which civilization developed and to which life on Earth is adapted, paleoclimate evidence and ongoing climate change suggest that CO2 will need to be reduced to at most 350 ppm.”
Dr. James Hansen (Goddard Institute for Space Studies)