1Sky was a United States-based campaign in support of federal action to stem global warming and promote renewable energy.1Sky was founded in the spring of 2007 when thirty climate campaigners were on a retreat in the Hudson Valley of New York state. Partners included Step It Up 2007 (and its global successor 350.org), the Clinton Global Initiative, Greenpeace, Oxfam, and the Energy Action Coalition. 1Sky merged into 350.org in 2011.