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Ann Arbor 350 is an international campaign that’s building a movement to unite the world around solutions to the climate crisis–the solutions that science and justice demand. 350 is the most important number in the world! Scientists say 350ppm is the safe upper limit for carbon dioxide in the atmosphere. Find out more on the global site,

Ann Arbor 350 is your link into doing something about climate change here in Washtenaw County! This site is gathering into one place a “Cookbook” of simple but powerful step-by-step recipes for taking community action. Our featured recipe is below, but you can explore them all in the Recipes for Community Action section.

Ongoing challenges for Ann Arbor 350 include the Garden Challenge and the Household Energy Challenge. To learn more, visit