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This month, Witness History brings you a collection of stories about environmentalists and their struggles to protect the natural world, including the Congolese botanist who tried to protect his patch of the Ituri rainforest, the storm-damaged tree in Kew gardens that taught the world a valuable lesson about arboriculture, the murdered Amazon activist Chico Mendes, and the fight to save the Great Barrier Reef. Plus an artistic tribute to Nigerian environmentalist Ken Saro-Wiwa.