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Tom Allinson
March 15, 2019

"The oceans are rising and so are we," read one placard in Sydney, Australia. Organizers estimate 2,052 demonstrations were planned in 123 countries across all continents, including Antarctica.

Sixteen-year-old Swedish activist Greta Thunberg, who kicked off the movement last year, lay down a simple challenge: "What will you do on March 15, 2019?"