Features include interactive map, in-depth stories, and more.Download now. »
The week's top five must-sees,
delivered to your inbox.
350.org is an international environmental organization, headed by author Bill McKibben, with the goal of building a global grassroots movement to raise awareness of anthropogenic climate change, to confront climate change denial, and to cut emissions of one of the greenhouse gases, carbon dioxide, in order to slow the rate of global warming. 350.org takes its name from the research of Goddard Institute for Space Studies scientist James E. Hansen, who posited in a 2007 paper that 350 parts-per-million of CO2 in the atmosphere is a safe upper limit to avoid a climate tipping point. (via Freebase)