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GLASGOW, SCOTLAND - NOVEMBER 01: US President Joe Biden removes his face mask as he arrives for the COP26 UN Climate Summit on November 1, 2021 in Glasgow, United Kingdom. 2021 sees the 26th United Nations Climate Change Conference. The conference will run from 31 October for two weeks, finishing on 12 November. It was meant to take place in 2020 but was delayed due to the Covid-19 pandemic. (Photo by Adrian Dennis - Pool/Getty Images)

GLASGOW, SCOTLAND - NOVEMBER 01: US President Joe Biden removes his face mask as he arrives for the COP26 UN Climate Summit on November 1, 2021 in Glasgow, United Kingdom. 2021 sees the 26th United Nations Climate Change Conference. The conference will run from 31 October for two weeks, finishing on 12 November. It was meant to take place in 2020 but was delayed due to the Covid-19 pandemic. (Photo by Adrian Dennis - Pool/Getty Images)