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Climate models project 21st century global temperatures. NASA's Scientific Visualization Studio and NASA Center for Climate Simulation hide caption
Big Data Predicts Centuries Of Harm If Climate Warming Goes Unchecked
Greenbuild Conference Showcases Energy Saving Technology For Buildings
Paris Continues To Recover As Global Leaders Attend Climate Summit
Record Breaking Smog In China, India Underlines Climate Summit In Paris
Obama Calls For Decisive Action Against Climate Change At Paris Summit
President Obama (from left), French President Francois Hollande and Microsoft co-founder Bill Gates applaud a speech during the Mission Innovation event at the UN conference on climate change Monday in Paris. Jim Watson/AFP/Getty Images hide caption
A building called Sustainability Base, at NASA's Ames Research Center in Mountain View, Calif., has an energy-efficient design that allows in sunlight. So for most of the year, the interior is illuminated by natural light. Dominic Hart/NASA hide caption
A view of the opening of COP21 on climate change Monday in Paris. More than 150 world leaders are meeting for the 21st Session of the Conference of Parties to the United Nations Framework Convention on Climate Change. Patrick Aventurier/Getty Images hide caption
A power-generating windmill turbine is seen in front of the Arc de Triomphe on the Champs Elysees avenue in Paris ahead of the COP21 World Climate Summit, which begins Monday. Christian Hartmann/Reuters /Landov hide caption
Delegates from about 170 countries gathered in Kyoto in December 1997 during the United Nations Framework Convention on Climate Change. This year in Paris, the stakes are even higher, negotiators say. AFP/Getty Images hide caption