More than 700 of the world's threatened and endangered animal species may be directly affected by climate change, according to a new study — vastly more than the number of animal species scientists initially thought would face risks from global warming. Scientists had previously determined that only 7 percent of mammals and 4 percent of birds on the International Union for Conservation of Nature (IUCN) "Red List" of threatened species are affected by climate change. In a comprehensive analysis of 130 previous studies on the subject, researchers found that nearly half of the world's threatened and endangered mammals and nearly a quarter of birds are already seriously impacted — more than 700 species total.
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