THE ISSUE
350.org is an international campaign dedicated to creating an equitable global climate treaty that lowers carbon dioxide below 350 parts per million.
350 is the number that leading scientists say is the safe upper limit for carbon dioxide measured in parts per million (ppm) in our atmosphere. 350 ppm is the number humanity needs to get back below as soon as possible to avoid runaway climate change. We are now very close to 390 ppm.
