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

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