350.org is an international environmental organization encouraging citizens to action with the belief that publicizing the increasing levels of carbon dioxide will pressure world leaders to address climate change and to reduce levels from 400 parts per million to 350 parts per million. It was founded by author Bill McKibben with the goal of building a global grassroots movement to raise awareness about human-driven climate change, to confront climate change denial, and to cut emissions of 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 (ppm) of CO2 in the atmosphere is a safe upper limit to avoid a climate tipping poin