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April 24, 2014 | 12:00 a.m. CST
Since the 1960s, environmental activists and legislators have fought battles for everything from water and food to energy and pollution. In a week with Earth Day on Tuesday and Columbia’s Earth Day Festival on Sunday in Peace Park, now is a good time to brush up on the major environmental movements from the past 50 years. Then you can hug a tree with the best of ‘em.