FILE - John Kerry, Special Presidential Envoy for Climate of the United States, left, listens to Xie Zhenhua, Special Envoy for Climate Change for China, during the World Economic Forum in Davos, Switzerland, May 24, 2022. Kerry and Xie are stepping down from their roles, marking a generational shift in the world of international climate negotiations. Activists and scientists hope that the world's two biggest emitters of greenhouse gases continue finding ways to collaborate to prevent the planet from heating up to catastrophic levels. (AP Photo/Markus Schreiber, File)
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