Tens of thousands of activists walked through Manhattan, warning that climate change is destroying the Earth - in stride with demonstrators around the world who urged policymakers to take quick action.
Most came on foot for the Sunday march, others with bicycles and walkers, and some even in wheelchairs. Many wore costumes and marched to drumbeats. One woman played the accordion. (Also Read: Leonardo also won the Clinton Global Citizen Award)
But their message was not entertaining:
He had first heard about global warming in 1967, "when no one was paying much attention," said Mr Garskof, a native New Yorker and professor of psychology at Connecticut's Quinnipiac University.
Actor Mark Ruffalo at the march. Image: AP
On Tuesday, more than 120 world leaders will convene for the United Nations Climate Summit aimed at galvanizing political will for a new global climate treaty by the end of 2015.
De Blasio said, "My sense is the energy you see on the streets, the numbers that have amassed here and in other cities around the world, show that something bigger is going on, and this UN summit will be one of the ones where we look back and say it was a difference maker," de Blasio said.
Musician Sting at the march. Image: AP
In London, organizers said 40,000 marchers participated, while a small gathering in Cairo featured a huge art piece representing wind and solar energy. In Rio de Janeiro, marchers with green hearts painted on their faces rallied at Ipanema Beach.
"This is important for every single person on the planet, which is why it has to be the greatest grassroots movement of all time," Thompson said. "This is the battle of our lives. We're fighting for our children."
In Australia, the largest rally was in Melbourne, where an estimated 10,000 people took to the streets with banners and placards calling on their government to do more to combat global warming.
Australian Prime Minister Tony Abbott was a particular target of the protesters in major Australian cities. Abbott's center-right coalition has removed a carbon tax and has restricted funding for climate change bodies since coming to power last year.
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