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A supporter holds a sign while walking to the People's Climate March on Denver Saturday, April 29, 2017 on 16th Street. Thousands affiliated with various climate and environmental organizations gathered to march and listen to speakers.

Reace Daniel chants with others during the People's Climate March on Denver Saturday, April 29, 2017 in the Civic Center. Thousands affiliated with various climate and environmental organizations gathered to march and listen to speakers.

Dance partners and Boulder residents Ray George and Nancy Petersen dance together during the People's Climate March on Denver Saturday, April 29, 2017 in the Civic Center. Thousands affiliated with various climate and environmental organizations gathered to march and listen to speakers.

Longmont resident Emma Douse, 14, holds a sign and American flag during the People's Climate March on Denver Saturday, April 29, 2017 in the Civic Center. Thousands affiliated with various climate and environmental organizations gathered to march and listen to speakers.

A participant holds an American flag during the People's Climate March on Denver Saturday, April 29, 2017 in the Civic Center. Thousands affiliated with various climate and environmental organizations gathered to march and listen to speakers.

Supporters cheer and hold signs during the People's Climate March on Denver Saturday, April 29, 2017 in the Civic Center. Thousands affiliated with various climate and environmental organizations gathered to march and listen to speakers.

Young supporters hold signs while listening to speakers during the People's Climate March on Denver Saturday, April 29, 2017 in the Civic Center. Thousands affiliated with various climate and environmental organizations gathered to march and listen to speakers.

Supporters hold signs during the People's Climate March on Denver Saturday, April 29, 2017 in the Civic Center. Thousands affiliated with various climate and environmental organizations gathered to march and listen to speakers.

Joel Szczesny, 6, hugs a tree while watching the People's Climate March on Denver Saturday, April 29, 2017 on Broadway. Thousands affiliated with various climate and environmental organizations gathered to march and listen to speakers.

Supporters hold signs while starting to march during the People's Climate March on Denver Saturday, April 29, 2017 in the Civic Center. Thousands affiliated with various climate and environmental organizations gathered to march and listen to speakers.

Supporters hold signs while participating in the People's Climate March on Denver Saturday, April 29, 2017 on Welton Street. Thousands affiliated with various climate and environmental organizations gathered to march and listen to speakers.

Sky Roosevelt-Morris, part of Colorado American Indian Movement, holds a sign during the People's Climate March on Denver Saturday, April 29, 2017 on Court Place. Thousands affiliated with various climate and environmental organizations gathered to march and listen to speakers.

Fort Collins resident Sean Hall holds signs during the People's Climate March on Denver Saturday, April 29, 2017 in the Civic Center. Thousands affiliated with various climate and environmental organizations gathered to march and listen to speakers.

Supporters look through Occupy Denver buttons during the People's Climate March on Denver Saturday, April 29, 2017 in the Civic Center. Proceeds of the buttons go toward feeding homeless on Fridays. Thousands affiliated with various climate and environmental organizations gathered to march and listen to speakers.

Supporters cheer and hold signs during the People's Climate March on Denver Saturday, April 29, 2017 in the Civic Center. Thousands affiliated with various climate and environmental organizations gathered to march and listen to speakers.