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Lauren Butler, 20, embraces a Mother Earth ball at UC Berkeley's Sproul Plaza on Earth Day, Tuesday April 22, 2014 during a celebration in Berkeley, Calif. Earth Day festivities are going on all week at UC Berkeley.(Doug Oakley/Bay Area News Group)

Lauren Butler, 20, embraces a Mother Earth ball at UC Berkeley's Sproul Plaza on April 22 as part of the school's Earth Week activities. Events, which have included a Human Oil Spill silent protest and historical talks, continue through Sunday. Details: http://bit.ly/1rkGLvL Doug Oakley/staff




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