In this Saturday, Dec. 12, 2015 photo, US President Barack Obama speaks about the Paris climate agreement from the Cabinet Room of the White House in Washington. About 160 countries are expected to sign the Paris Agreement on climate change Friday, April 22, 2016, in a symbolic triumph for a landmark deal that once seemed unlikely but now appears on track to enter into force years ahead of schedule. The U.S. and China, which together account for nearly 40 percent of global emissions, have said they intend to formally join the agreement this year. (AP Photo/Jacquelyn Martin, File)
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