At the marquee event yesterday, the Peoples Climate March in Washington, DC, tens of thousands of demonstrators made their way down Pennsylvania Avenue in sweltering heat on their way to encircle the White House.
Organisers said about 300 sister marches or rallies were being held around the country, including in Seattle, Boston and San Francisco. In Chicago, marchers headed from the city's federal plaza to Trump Tower.
"We are here because there is no Planet B," the Rev Mariama White-Hammond of Bethel AME Church told the crowd in Boston.
Trump has called climate change a hoax, disputing the overwhelming consensus of scientists that the world is warming and that man-made carbon emissions are primarily to blame. More than 2,000 people gathered at the Maine State House in Augusta. Speakers included a lobsterman, a solar company owner and members of the Penobscot Nation tribe.
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"I've seen firsthand the impacts of climate change to not only the Gulf of Maine, but also to our evolving fisheries, and to the coastal communities that depend upon them," said lobsterman Richard Nelson, of Friendship, Maine.
"But I see untapped power here today," she said.
A demonstration stretched for several blocks in downtown Tampa, Florida, where marchers said they were concerned about the threat rising seas pose to the city.
People gathered on Boston Common carried signs with slogans such as "Dump Trump." Handmade signs at Seattle's march included the general "Love Life" and the specific "Don't Kill Otters."
"Honoured to join Indigenous leaders and native peoples as they fight for climate justice," DiCaprio tweeted.
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