In My Green Manifesto, David Gessner embarks on a rough-and-tumble journey down Boston's Charles River, searching for the soul of a new environmentalism. With a tragically leaky canoe, a broken cell phone, a cooler of beer, and the environmental planner Dan Driscoll in tow, Gessner grapples with the stereotype of the environmentalist as an overzealous, puritanical mess. But as Dan recounts his own story of transforming the famously polluted Charles into an urban haven for wildlife and wild people, the vision of a new sort of eco-champion begins to emerge: someone who falls in love with a forgotten space, and then fights like hell for it. Considering everything from Ed Abbey's legacy to Jimmy Carter's sweater, Gessner points toward a scrappy environmentalism that, despite all odds, just might change the world.