Bill McKibben and 350.org on the 'Do the Math' TourA 21-city tour to demonstrate the simple numbers that add up to global catastrophe
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Growing the Movement
"We have a little tradition for every show: 'Family photos' that help show how much our movement is growing as we travel the country. I must say, seeing this photo from our first stop in Seattle was incredibly impressive, and every show since has been just as packed and full of energy." –B.M.