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Green Sea Turtles in the waters of Bora Bora, Tahiti are seen in this undated photograph from an exhibit titled "Irreplaceable: Wildlife in a Warming World," recently shown at the Peerless building in downtown Providence, Rhode Island. The exhibit showcased animals most threatened by global warming, such as green sea turtles. The gender of sea turtle eggs are determined by temperature, which means global warming would upset the natural gender balance.