Global Climate Strike urges action on climate change (29 images)

More than 2,500 strikes and other activities were planned in 156 countries for September 20 and 27 as part of the Global Climate Strike -- a show of opposition toward what organizers say is government inaction in fighting climate change.

Swedish environmental activist Greta Thunberg waits to speak on the stage as thousands gather at Battery Park. Photo by John Angelillo/UPI

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Thousands of people cross the Brooklyn Bridge and some hold up signs as they march in the direction of the Global Climate Strike. Photo by John Angelillo/UPI

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Swedish environmental activist Greta Thunberg told attendees, "We demand a safe future." Photo by John Angelillo/UPI

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The Global Climate Strike drew thousands in New York City. Photo by John Angelillo/UPI

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