350.org is an international grassroots campaign that aims to mobilize a global climate movement united by a common call to action. 350 represents the parts per million carbon dioxide concentration that leading scientists, including Dr. James Hansen, Director of the NASA Goddard Institute for Space Studies, have now set as an upper threshold for a safe climate. International climate negotiations are now focused on targets that are scientifically inaccurate and dangerously inadequate. Their mission is to move the goalpost, to make sure that the world is aiming for a target that will actually avert dangerous climate change. In the next two years they want to embed the number 350 deeply in public consciousness"make it ubiquitous across societies, languages, and ideologies.