The Obama administration has released what it calls one of the most comprehensive analyses to date on the impact of climate change. The Environmental Protection Agency found global action to address climate change could save tens of thousands of lives and hundreds of billions of dollars annually in the United States by the end of the century. The report comes as researchers at Stanford, Princeton and Berkeley have confirmed the world is entering its sixth mass extinction, fueled by climate change, with certain species disappearing at about 100 times the normal rate.