GLASGOW—Organizers of the COP26 United Nations climate summit welcomed one of their highest-profile critics Friday: Greta Thunberg.
Ms. Thunberg headlined an hourslong protest march and rally in Glasgow. Thousands of mostly young protesters, carrying colorful banners and sometimes accompanied by their parents, marched from Glasgow’s Kelvingrove Park to the city center. Organizers estimated the protest drew 25,000 participants.
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