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British Prime Minister Boris Johnson, left, and UN Secretary-General Antonio Guterres, right, greet U.S. President Joe Biden , at the COP26 U.N. Climate Summit in Glasgow, Scotland, Monday, Nov. 1, 2021. The U.N. climate summit in Glasgow gathers leaders from around the world, in Scotland's biggest city, to lay out their vision for addressing the common challenge of global warming. (Christopher Furlong/Pool via AP)