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Former U.S. President Barack Obama walks over to greet members of the US delegation at the US Center at the COP26 U.N. Climate Summit in Glasgow, Scotland, Tuesday, Nov. 9, 2021. The U.N. climate summit in Glasgow has entered it's second week as leaders from around the world, are gathering in Scotland's biggest city, to lay out their vision for addressing the common challenge of global warming. (AP Photo/Alberto Pezzali)