Young people must be prepared to strike for a long time for action on climate change and not back down, the Swedish climate activist Greta Thunberg has told a rally in Denver.

Thunberg said she and fellow youth activists would not beg those in power to act because she expected leaders to keep ignoring them.

“We will instead tell them, if they won’t do it, we will,” the 16-year-old said to loud cheers on Friday. “The world is waking up and we are the change. The change is coming whether you like it or not.”

Thunberg spoke for several minutes to a crowd of several thousand at Civic Center Park near the state capitol building. The rally highlighted Colorado activists, like Madhvi Chittoor, 8, who has campaigned in the state against plastics.

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Thunberg again scolded leaders for not doing enough to fight climate change and for ignoring science. Echoing a line from an angry speech at the United Nations last month that drew global attention, she said several times of leaders, “How dare they,” with some in the crowd repeating the line.

Thunberg began holding solitary demonstrations outside Sweden’s parliament in August 2018, skipping classes once a week to protest about climate change. Her “Fridays for Future” demonstrations have inspired millions across the world to stage protests urging leaders to tackle global warming.

Thunberg’s Denver appearance followed rallies in North Dakota’s Standing Rock Indian Reservation and in Rapid City and the Pine Ridge Indian Reservation in South Dakota. She plans to keep touring the Americas through a UN climate conference in Chile in December.

Thunberg began her remarks by acknowledging that the crowd had gathered on land that once belonged to the Cheyenne and Arapahoe tribes.

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Those attending included fourth graders from the Downtown Denver Expeditionary School who have been studying climate change.

Zariah Edwards, 9, said she had learned to unplug appliances when not using them, to save energy. Malisse Doung, also 9, said her class learned how the changing climate was affecting polar bears.

Ellie Rusinova of Denver was among a group of adults taking photos of Thunberg with their cellphones from the edge of the park’s amphitheater. She said she thought Thunberg’s plain and clear way of speaking was very powerful and captured the feelings of many. “We have all felt that we need to make a change,” she said.