350.org is a global environmental organization founded in 2008 by writer and activist Bill McKibben and a group of university friends. The organization’s name refers to the safe level of carbon dioxide in the atmosphere—350 parts per million—necessary to avoid the most catastrophic impacts of climate change. 350.org is known for its grassroots campaigns, which mobilize people around the world to take action against fossil fuel extraction and advocate for renewable energy. They played a significant role in the global movement to divest from fossil fuels and has organized numerous climate marches, including the largest climate mobilization in history, the People's Climate March in 2014.
