Climate activist Greta Thunberg addresses climate change in New York.

Tens of thousands of protesters — from Australia to Thailand to London — joined Global Climate Strike marches and rallies worldwide Friday to express their concern about climate change.

While supporters of all ages are turning out, the day was billed as a walkout by high school students to call on world leaders to step up their efforts against carbon emissions and other environmental issues.

In the U.S., New York City's 1.1 million school students were excused from class to participate in the strike protests. Demonstrators in Washington, D.C., planned a march to Capitol Hill.
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