(FILES) This file handout photo made available on July 17, 2020 by Polar Bears International shows a polar bear standing on melting sea ice in Svalbard, Norway, in 2013. President Joe Biden hopes to give a shot of adrenaline to the planet's sluggish fight against climate change with an Earth Day summit but a question lingers -- can the United States be trusted to lead? 
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The UAE will host the UN Climate Changed Conference (Cop28) in November. AFP

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