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British Prime Minister Boris Johnson, left, and United Nations Secretary General Antonio Guterres, right, greet Switzerland's President Guy Parmelin during arrivals 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. (AP Photo/Alastair Grant, Pool)