Phan Sopheak, a rice farmer in Cambodia, rests shortly after a man wielding an axe attacked her. She had been patrolling the Prey Lang forest around her village with a volunteer group that is trying to stop illegal logging. Courtesy of Prey Lang Community Network hide caption

toggle caption Courtesy of Prey Lang Community Network

#EarthDay: The High Cost Of Eco-Activism

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Secretary of State John Kerry holds his 2-year-old granddaughter, Isabel Dobbs-Higginson, as he signs a far-reaching climate accord at the United Nations, in a ceremony timed to coincide with Earth Day on Friday. Spencer Platt/Getty Images hide caption

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A view of a phytoplankton bloom near Alaska's Pribilof Islands. The milky green and light blue shading of the water indicates the presence of vast populations of microscopic phytoplankton. NASA hide caption

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Volunteer Tom Strain carries debris from an empty lot as part of an Earth Day cleanup effort in Camden, N.J. The Earth Day events celebrated on April 22 promote a sustainable and clean environment. Mel Evans/AP hide caption

toggle caption Mel Evans/AP