Thousands of people gathered across the country to march in protest of President Donald Trump's environmental policies, which have included rolling back restrictions on mining, oil drilling and greenhouse gas emissions at coal-fired power plants. The demonstrators sat down for 100 seconds to mark Trump's first 100 days in office.
Thousands March Against Trump Administration Policies on Climate Change

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Participants walk along Pennsylvania Ave., in front of the White House in Washington, during a demonstration and march, April 29, 2017. Thousands of people gather across the country to march in protest of President Donald Trump's environmental policies, which have included rolling back restrictions on mining, oil drilling and greenhouse gas emissions at coal-fired power plants.

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Demonstrators sit on the ground along Pennsylvania Ave. in front of the White House in Washington during a demonstration and march, April 29, 2017.

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Dori Mann takes a snapshot of friends and family posing with a snowman draped with an anti-Trump sign as they all participated in a climate change awareness march and rally, in Denver, April 29, 2017.

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President Donald Trump supporters hold a counter rally during "100 Days of Failure" protest and march in New York, April 29, 2017.