Covering Climate Now: In 144 countries and some 4,800 protests, young and old will join forces in the Sept. 20-27 climate strikes, part of the Fridays for Future movement begun by Swedish teen Greta Thunberg.

Why join the latest global climate strikes? Environmentalist and 350.org co-founder Bill McKibben makes his case.

Covering Climate Now: The Guardian is providing live updates throughout the day from climate strikes around the world.

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