Warming toll: 1 degree hotter, trillions of tons of ice gone

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Since leaders first started talking about tackling the problem of climate change, the world has spewed more heat-trapping gases, gotten hotter and suffered hundreds of extreme weather disasters. The first United Nations diplomatic conference to tackle climate change was in Rio de Janeiro in 1992. — The carbon dioxide level in the air has jumped from about 358 parts per million to nearly 412, according to the U.S. National Oceanic and Atmospheric Administration.