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Samuel Avery is a certified solar installer, longtime social activist, and trainer in nonviolent resistance techniques. He is the author of four books, including The Buddha and the Quantum and The Globalist Papers. He lives in Louisville, Kentucky. Bill McKibben is an environmentalist, activist, and the cofounder and chairman of the board of 350.org. He is the author of Eaarth and The End of Nature. He lives in Vermont.