Climate change is influenced by humans

Bryan Arroyo, assistant director for the Endangered Species program at the U.S. Fish and Wildlife Service spoke today about polar bears being put in the threatened species list. He said that we are in a changing climate and while there are disagreements about the magnitude, but the scientific research is clear and climate change is occurring. There is a 90 percent probability that climate change is influenced or forced by human release of greenhouse gases. (1:01)
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