People around the world are taking part in marches and strikes on Sept. 20 in support of tackling climate change.
The events have been inspired by Greta Thunberg, the 16-year-old Swede who started a school strike for stronger action against climate change last year. As of Sept. 19 at least 4,638 events in 139 countries had been planned, Thunberg posted on Twitter.
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