Thousands march in NYC, around globe over climate

45 PHOTOS
Climate Change March - New York - 9/21/2014
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Thousands march in NYC, around globe over climate
Marchers make their way across Central Park South during the People's Climate March on September 21 2014, in New York. Activists mobilized in cities across the globe Sunday for marches against climate change, with one of the biggest planned for New York, where celebrities, political leaders and tens of thousands of people were expected. The march comes before the United Nations Secretary-General Ban Ki-moon convenes a climate change summit of 120 world leaders . AFP PHOTO/Timothy A. Clary (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
Musician Sting walks down 6th Avenue during the People's Climate March on September 21, 2014, in New York. Activists mobilized in cities across the globe Sunday for marches against climate change, with one of the biggest planned for New York, where celebrities, political leaders and tens of thousands of people were expected. The march comes before the United Nations Secretary-General Ban Ki-moon convenes a climate change summit of 120 world leaders . AFP PHOTO/Timothy A. Clary (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
Marchers come down 6th Ave during the People's Climate March on September 21 2014, in New York. Activists mobilized in cities across the globe Sunday for marches against climate change, with one of the biggest planned for New York, where celebrities, political leaders and tens of thousands of people were expected. The march comes before the United Nations Secretary-General Ban Ki-moon convenes a climate change summit of 120 world leaders . AFP PHOTO/Timothy A. Clary (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
Actor Leonardo DiCaprio walks down 6th Avenue during the People's Climate March on September 21, 2014, in New York. Activists mobilized in cities across the globe Sunday for marches against climate change, with one of the biggest planned for New York, where celebrities, political leaders and tens of thousands of people were expected. The march comes before the United Nations Secretary-General Ban Ki-moon convenes a climate change summit of 120 world leaders . AFP PHOTO/Timothy A. Clary (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
Children run underneath a large banner with demonstrators gathered for the People's Climate March in New York, U.S., on Sept. 21, 2014. The United Nations 2014 Climate Summit is scheduled for Sept. 23. Photographer: Timothy Fadek/Bloomberg via Getty Images
NEW YORK, NY - SEPTEMBER 21: People protest for greater action against climate change during the People's Climate March on September 21, 2014 in New York City. The march, which calls for drastic political and economic changes to slow global warming, has been organized by a coalition of unions, activists, politicians and scientists. (Photo by Andrew Burton/Getty Images)
NEW YORK, NY - SEPTEMBER 21: People protest for greater action against climate change during the People's Climate March on September 21, 2014 in New York City. The march, which calls for drastic political and economic changes to slow global warming, has been organized by a coalition of unions, activists, politicians and scientists. (Photo by Andrew Burton/Getty Images)
Marchers come down 6th Ave during the People's Climate March on September 21 2014, in New York. Activists mobilized in cities across the globe Sunday for marches against climate change, with one of the biggest planned for New York, where celebrities, political leaders and tens of thousands of people were expected. The march comes before the United Nations Secretary-General Ban Ki-moon convenes a climate change summit of 120 world leaders . AFP PHOTO/Timothy A. Clary (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
Demonstrators hold signs on a street next to Central Park during the People's Climate March in New York, U.S., on Sept. 21, 2014. The United Nations 2014 Climate Summit is scheduled for Sept. 23. Photographer: Timothy Fadek/Bloomberg via Getty Images
Demonstrators hold signs during the People's Climate March in New York, U.S., on Sept. 21, 2014. The United Nations 2014 Climate Summit is scheduled for Sept. 23. Photographer: Timothy Fadek/Bloomberg via Getty Images
NEW YORK, NY - SEPTEMBER 21: Sting attends The People's Climate March on September 21, 2014 in New York City. (Photo by Rob Kim/Getty Images)
NEW YORK, NY - SEPTEMBER 21: People protest for greater action against climate change during the People's Climate March on September 21, 2014 in New York City. The march, which calls for drastic political and economic changes to slow global warming, has been organized by a coalition of unions, activists, politicians and scientists. (Photo by Andrew Burton/Getty Images)
NEW YORK, NY - SEPTEMBER 21: People protest for greater action against climate change during the People's Climate March on September 21, 2014 in New York City. The march, which calls for drastic political and economic changes to slow global warming, has been organized by a coalition of unions, activists, politicians and scientists. (Photo by Andrew Burton/Getty Images)
NEW YORK, NY - SEPTEMBER 21: People protest for greater action against climate change during the People's Climate March on September 21, 2014 in New York City. The march, which calls for drastic political and economic changes to slow global warming, has been organized by a coalition of unions, activists, politicians and scientists. (Photo by Andrew Burton/Getty Images)
Marchers come down 6th Ave during the People's Climate March on September 21 2014, in New York. Activists mobilized in cities across the globe Sunday for marches against climate change, with one of the biggest planned for New York, where celebrities, political leaders and tens of thousands of people were expected. The march comes before the United Nations Secretary-General Ban Ki-moon convenes a climate change summit of 120 world leaders . AFP PHOTO/Timothy A. Clary (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
NEW YORK, NY - SEPTEMBER 21: People protest for greater action against climate change during the People's Climate March on September 21, 2014 in New York City. The march, which calls for drastic political and economic changes to slow global warming, has been organized by a coalition of unions, activists, politicians and scientists. (Photo by Andrew Burton/Getty Images)
NEW YORK, NY - SEPTEMBER 21: People protest for greater action against climate change during the People's Climate March on September 21, 2014 in New York City. The march, which calls for drastic political and economic changes to slow global warming, has been organized by a coalition of unions, activists, politicians and scientists. (Photo by Andrew Burton/Getty Images)
NEW YORK, NY - SEPTEMBER 21: People protest for greater action against climate change during the People's Climate March on September 21, 2014 in New York City. The march, which calls for drastic political and economic changes to slow global warming, has been organized by a coalition of unions, activists, politicians and scientists. (Photo by Andrew Burton/Getty Images)
Actor Leonardo DiCaprio walks down 6th Avenue during the People's Climate March on September 21, 2014, in New York. Activists mobilized in cities across the globe Sunday for marches against climate change, with one of the biggest planned for New York, where celebrities, political leaders and tens of thousands of people were expected. The march comes before the United Nations Secretary-General Ban Ki-moon convenes a climate change summit of 120 world leaders . AFP PHOTO/Timothy A. Clary (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
Marchers come down 6th Ave during the People's Climate March on September 21 2014, in New York. Activists mobilized in cities across the globe Sunday for marches against climate change, with one of the biggest planned for New York, where celebrities, political leaders and tens of thousands of people were expected. The march comes before the United Nations Secretary-General Ban Ki-moon convenes a climate change summit of 120 world leaders . AFP PHOTO/Timothy A. Clary (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
Marchers come down 6th Ave during the People's Climate March on September 21 2014, in New York. Activists mobilized in cities across the globe Sunday for marches against climate change, with one of the biggest planned for New York, where celebrities, political leaders and tens of thousands of people were expected. The march comes before the United Nations Secretary-General Ban Ki-moon convenes a climate change summit of 120 world leaders . AFP PHOTO/Timothy A. Clary (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
NEW YORK, NY - SEPTEMBER 21: People protest for greater action against climate change during the People's Climate March on September 21, 2014 in New York City. The march, which calls for drastic political and economic changes to slow global warming, has been organized by a coalition of unions, activists, politicians and scientists. (Photo by Andrew Burton/Getty Images)
NEW YORK, NY - SEPTEMBER 21: People protest for greater action against climate change during the People's Climate March on September 21, 2014 in New York City. The march, which calls for drastic political and economic changes to slow global warming, has been organized by a coalition of unions, activists, politicians and scientists. (Photo by Andrew Burton/Getty Images)
A demonstrator holds a sign during the People's Climate March in New York, U.S., on Sunday, Sept. 21, 2014. The United Nations 2014 Climate Summit is scheduled for Sept. 23. Photographer: Timothy Fadek/Bloomberg via Getty Images
Demonstrators hold signs during the People's Climate March in New York, U.S., on Sunday, Sept. 21, 2014. The United Nations 2014 Climate Summit is scheduled for Sept. 23. Photographer: Timothy Fadek/Bloomberg via Getty Images
Demonstrators hold signs during the People's Climate March in New York, U.S., on Sunday, Sept. 21, 2014. The United Nations 2014 Climate Summit is scheduled for Sept. 23. Photographer: Timothy Fadek/Bloomberg via Getty Images
A demonstrator holds a sign during the People's Climate March in New York, U.S., on Sunday, Sept. 21, 2014. The United Nations 2014 Climate Summit is scheduled for Sept. 23. Photographer: Timothy Fadek/Bloomberg via Getty Images
Demonstrators hold signs during the People's Climate March in New York, U.S., on Sunday, Sept. 21, 2014. The United Nations 2014 Climate Summit is scheduled for Sept. 23. Photographer: Timothy Fadek/Bloomberg via Getty Images
A demonstrator wears a flag as a cape during the People's Climate March in New York, U.S., on Sunday, Sept. 21, 2014. The United Nations 2014 Climate Summit is scheduled for Sept. 23. Photographer: Timothy Fadek/Bloomberg via Getty Images
Demonstrators roll a model of the planet Earth down the street during the People's Climate March in New York, U.S., on Sunday, Sept. 21, 2014. The United Nations 2014 Climate Summit is scheduled for Sept. 23. Photographer: Timothy Fadek/Bloomberg via Getty Images
Demonstrators hold signs during the People's Climate March in New York, U.S., on Sunday, Sept. 21, 2014. The United Nations 2014 Climate Summit is scheduled for Sept. 23. Photographer: Timothy Fadek/Bloomberg via Getty Images
A demonstrator plays a guitar while others hold signs during the People's Climate March in New York, U.S., on Sunday, Sept. 21, 2014. The United Nations 2014 Climate Summit is scheduled for Sept. 23. Photographer: Timothy Fadek/Bloomberg via Getty Images
Demonstrators march during the People's Climate March in New York, U.S., on Sunday, Sept. 21, 2014. The United Nations 2014 Climate Summit is scheduled for Sept. 23. Photographer: Timothy Fadek/Bloomberg via Getty Images
Demonstrators hold an Adbusters.org American flag during the People's Climate March in New York, U.S., on Sunday, Sept. 21, 2014. The United Nations 2014 Climate Summit is scheduled for Sept. 23. Photographer: Timothy Fadek/Bloomberg via Getty Images
A demonstrator holds up a sign during the People's Climate March in New York, U.S., on Sunday, Sept. 21, 2014. The United Nations 2014 Climate Summit is scheduled for Sept. 23. Photographer: Timothy Fadek/Bloomberg via Getty Images
Marchers come down 6th Ave during the People's Climate March on September 21 2014, in New York. Activists mobilized in cities across the globe Sunday for marches against climate change, with one of the biggest planned for New York, where celebrities, political leaders and tens of thousands of people were expected. The march comes before the United Nations Secretary-General Ban Ki-moon convenes a climate change summit of 120 world leaders . AFP PHOTO/Timothy A. Clary (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
French Foreign Minister Laurent Fabius takes part in the 'People's Climate March' on September 21, 2014 in New York. Activists mobilized in cities across the globe Sunday for marches against climate change, with one of the biggest planned for New York, where celebrities, political leaders and tens of thousands of people were expected. The march comes before the United Nations Secretary-General Ban Ki-moon convenes a climate change summit of 120 world leaders. AFP PHOTO/Don Emmert (Photo credit should read DON EMMERT/AFP/Getty Images)
United Nations Secretary-General Ban Ki-moon and his wife Yoo Soon-taek take part in the 'People's Climate March' on September 21, 2014 in New York. Activists mobilized in cities across the globe Sunday for marches against climate change, with one of the biggest planned for New York, where celebrities, political leaders and tens of thousands of people were expected. The march comes before the United Nations Secretary-General Ban Ki-moon convenes a climate change summit of 120 world leaders. AFP PHOTO/Don Emmert (Photo credit should read DON EMMERT/AFP/Getty Images)
NEW YORK, NY - SEPTEMBER 21: United Nations Secretary General Ban Ki-Moon participates in the People's Climate March on September 21, 2014 in New York City. The march, which calls for drastic political and economic changes to slow global warming, has been organized by a coalition of unions, activists, politicians and scientists. (Photo by Andrew Burton/Getty Images)
NEW YORK, NY - SEPTEMBER 21: (L-R) Primatologist Jane Goodall, Former U.S. Vice President and environmental activist Al Gore, New York City Mayor Bill deBlasio and United Nations Secretary General Ban Ki-Moon participates in the People's Climate March on September 21, 2014 in New York City. The march, which calls for drastic political and economic changes to slow global warming, has been organized by a coalition of unions, activists, politicians and scientists. (Photo by Andrew Burton/Getty Images)
NEW YORK, NY - SEPTEMBER 21: People protest for greater action against climate change during the People's Climate March on September 21, 2014 in New York City. The march, which calls for drastic political and economic changes to slow global warming, has been organized by a coalition of unions, activists, politicians and scientists. (Photo by Andrew Burton/Getty Images)
NEW YORK, UNITED STATES - SEPTEMBER 21: Illuminated UN headquarters is seen during a ceremony ahead of climate march at the UN headquarters in New York, United States on September 21, 2014. The Hollywood star was named United Nations Messenger of Peace on Climate Change. (Photo by Selcuk Acar/Anadolu Agency/Getty Images)
NEW YORK, UNITED STATES - SEPTEMBER 21: Illuminated UN headquarters is seen during a ceremony ahead of climate march at the UN headquarters in New York, United States on September 21, 2014. The Hollywood star was named United Nations Messenger of Peace on Climate Change. (Photo by Selcuk Acar/Anadolu Agency/Getty Images)
NEW YORK, UNITED STATES - SEPTEMBER 21: Illuminated UN headquarters is seen during a ceremony ahead of climate march at the UN headquarters in New York, United States on September 21, 2014. The Hollywood star was named United Nations Messenger of Peace on Climate Change. (Photo by Selcuk Acar/Anadolu Agency/Getty Images)
NEW YORK, UNITED STATES - SEPTEMBER 21: Illuminated UN headquarters is seen during a ceremony ahead of climate march at the UN headquarters in New York, United States on September 21, 2014. The Hollywood star was named United Nations Messenger of Peace on Climate Change. (Photo by Selcuk Acar/Anadolu Agency/Getty Images)
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By VERENA DOBNIK & MICHAEL SISAK

NEW YORK (AP) - Tens of thousands of activists walked through Manhattan on Sunday, warning that climate change is destroying the Earth - in stride with demonstrators around the world who urged policymakers to take quick action.

Starting along Central Park West, most came on foot, others with bicycles and walkers, and some even in wheelchairs. Many wore costumes and marched to drumbeats. One woman played the accordion.

But their message was not entertaining:

"We're going to lose our planet in the next generation if things continue this way," said Bert Garskof, 81, as a family member pushed his wheelchair through Times Square.

He had first heard about global warming in 1967, "when no one was paying much attention," said Garskof, a native New Yorker and professor of psychology at Connecticut's Quinnipiac University.

Organizers said more than 100,000 marched in New York, including actors Mark Ruffalo and Evangeline Lilly. They were joined in midtown Manhattan by United Nations Secretary-General Ban Ki-moon, former Vice President Al Gore and New York City Mayor Bill de Blasio.

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.

"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 U.N. summit will be one of the ones where we look back and say it was a difference maker," de Blasio said.

Ban agreed.

"Climate change is a defining issue of our time and there is no time to lose," he said. "There is no Plan B because we do not have planet B. We have to work and galvanize our action."

The New York march was one of a series of events held around the world to raise awareness about climate change.

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 at Ipanema Beach had green hearts painted on their faces.

(Editor's note: here's a look at more climate change marches around the globe)

41 PHOTOS
Climate Change March - Worldwide - 9/21/2014
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Thousands march in NYC, around globe over climate
Senator Edward 'Ed' Markey, a Democrat from Massachusetts, from right, Senator Charles Schumer, a Democrat from New York, and Senator Al Franken, a Democrat from Minnesota, hold a news conference on Keystone XL pipeline amendments at the U.S. Capitol in Washington, D.C., U.S., on Tuesday, Jan. 20, 2015. Senate Democratic leaders will push hard for full Senate vote on an amendment to Keystone XL pipeline legislation that puts all senators on record on their views about whether carbon emissions spark climate change, said Schumer. Photographer: Andrew Harrer/Bloomberg via Getty Images
Senator Al Franken, a Democrat from Minnesota, from left, Senator Charles Schumer, a Democrat from New York, and Senator Edward 'Ed' Markey, a Democrat from Massachusetts, hold a news conference on Keystone XL pipeline amendments at the U.S. Capitol in Washington, D.C., U.S., on Tuesday, Jan. 20, 2015. Senate Democratic leaders will push hard for full Senate vote on an amendment to Keystone XL pipeline legislation that puts all senators on record on their views about whether carbon emissions spark climate change, said Schumer. Photographer: Andrew Harrer/Bloomberg via Getty Images
Demonstrators display placards and banners as they participate in the Peoples Climate March in London on September 21, 2014. The march was one of several demonstrations calling for action to combat climate change taking place at cities around the world. AFP PHOTO/ADRIAN DENNIS (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
A child in costume as demonstrators display placards and banners as they participate in the Peoples Climate March in London on September 21, 2014. The march was one of several demonstrations calling for action to combat climate change taking place at cities around the world. AFP PHOTO/ADRIAN DENNIS (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
RIO DE JANEIRO, BRAZIL - SEPTEMBER 21: A man waves a flag with a green heart during the climate march along Ipanema beach on September 21, 2014 in Rio de Janeiro, Brazil. Protests calling for curbs in greenhouse gas emissions were scheduled for today in 150 countries ahead a U.N. summit on climate change. The Amazon rainforest, mostly located in Brazil, produces about 20 percent of the earth's oxygen but is threatened by deforestation. (Photo by Mario Tama/Getty Images)
RIO DE JANEIRO, BRAZIL - SEPTEMBER 21: Participants brave inclement weather to take part in the climate march along Ipanema beach on September 21, 2014 in Rio de Janeiro, Brazil. Protests calling for curbs in greenhouse gas emissions were scheduled today in 150 countries ahead a U.N. summit on climate change. The Amazon rainforest, mostly located in Brazil, produces about 20 percent of the earth's oxygen but is threatened by deforestation. (Photo by Mario Tama/Getty Images)
RIO DE JANEIRO, BRAZIL - SEPTEMBER 21: Participants brave inclement weather to take part in the climate march along Ipanema beach on September 21, 2014 in Rio de Janeiro, Brazil. Protests calling for curbs in greenhouse gas emissions were scheduled today in 150 countries ahead a U.N. summit on climate change. The Amazon rainforest, mostly located in Brazil, produces about 20 percent of the earth's oxygen but is threatened by deforestation. (Photo by Mario Tama/Getty Images)
RIO DE JANEIRO, BRAZIL - SEPTEMBER 21: Participants chant during the climate march along Ipanema beach on September 21, 2014 in Rio de Janeiro, Brazil. Protests calling for curbs in greenhouse gas emissions were scheduled for today in 150 countries ahead a U.N. summit on climate change. The Amazon rainforest, mostly located in Brazil, produces about 20 percent of the earth's oxygen but is threatened by deforestation. (Photo by Mario Tama/Getty Images)
A climate protester wearing a Guy Fawkes mask holds a banner reading ' World leaders act!' on the Republique's square during a demonstration to fight climate change, on September 21, 2014 in Paris. AFP PHOTO / FRANCOIS GUILLOT (Photo credit should read FRANCOIS GUILLOT/AFP/Getty Images)
Climate protesters gather on the Republique's square during a demonstration to fight climate change, on September 21, 2014 in Paris. AFP PHOTO / FRANCOIS GUILLOT (Photo credit should read FRANCOIS GUILLOT/AFP/Getty Images)
Climate protesters hold a banner reading ' I am the change' on the Republique's square during a demonstration to fight climate change, on September 21, 2014 in Paris. AFP PHOTO / FRANCOIS GUILLOT (Photo credit should read FRANCOIS GUILLOT/AFP/Getty Images)
Climate protesters hold a banner reading ' Let's be the change' on the Republique's square during a demonstration to fight climate change, on September 21, 2014 in Paris. AFP PHOTO / FRANCOIS GUILLOT (Photo credit should read FRANCOIS GUILLOT/AFP/Getty Images)
Demonstrators display placards and banners as they participate in the Peoples Climate March in London on September 21, 2014. The march was one of several demonstrations calling for action to combat climate change taking place at cities around the world. AFP PHOTO/ADRIAN DENNIS (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
Enviromental protesters gather in a park in Sydney September 21, 2014 as part of a global protest on climate change. Australians rallied for climate action forming a human chain message as part of an international day of action to fight climate change ahead of a United Nations summit in New York on 23 September. AFP PHOTO/Peter PARKS (Photo credit should read PETER PARKS/AFP/Getty Images)
Enviromental protesters gather in a park in Sydney September 21, 2014 as part of a global protest on climate change. Australians rallied for climate action forming a human chain message as part of an international day of action to fight climate change ahead of a United Nations summit in New York on 23 September. AFP PHOTO/Peter PARKS (Photo credit should read PETER PARKS/AFP/Getty Images)
Enviromental protesters gather in a park in Sydney September 21, 2014 as part of a global protest on climate change. Australians rallied for climate action forming a human chain message as part of an international day of action to fight climate change ahead of a United Nations summit in New York on 23 September. AFP PHOTO/Peter PARKS (Photo credit should read PETER PARKS/AFP/Getty Images)
Enviromental protesters gather in a park in Sydney September 21, 2014 as part of a global protest on climate change. Australians rallied for climate action forming a human chain message as part of an international day of action to fight climate change ahead of a United Nations summit in New York on 23 September. AFP PHOTO/Peter PARKS (Photo credit should read PETER PARKS/AFP/Getty Images)
NEW DELHI, INDIA - SEPTEMBER 20: People participating during the Climate Change March at Mandi House to Jantar Mantar on September 20, 2014 in New Delhi, India. The march is a global movement with participation of college students, kids, other civil society allies, young professionals, rights groups, resident welfare associations and farming communities. The march is set up ahead of United Nations Summit on Climate change in New York on September 23 lead by UN Secretary General Mr. Ban Ki Moon. (Photo by Sonu Mehta/Hindustan Times via Getty Images)
NEW DELHI, INDIA - SEPTEMBER 20: People participating during the Climate Change March at Mandi House to Jantar Mantar on September 20, 2014 in New Delhi, India. The march is a global movement with participation of college students, kids, other civil society allies, young professionals, rights groups, resident welfare associations and farming communities. The march is set up ahead of United Nations Summit on Climate change in New York on September 23 lead by UN Secretary General Mr. Ban Ki Moon. (Photo by Sonu Mehta/Hindustan Times via Getty Images)
NEW DELHI, INDIA - SEPTEMBER 20: People participating during the Climate Change March at Mandi House to Jantar Mantar on September 20, 2014 in New Delhi, India. The march is a global movement with participation of college students, kids, other civil society allies, young professionals, rights groups, resident welfare associations and farming communities. The march is set up ahead of United Nations Summit on Climate change in New York on September 23 lead by UN Secretary General Mr. Ban Ki Moon. (Photo by Sonu Mehta/Hindustan Times via Getty Images)
NEW DELHI, INDIA - SEPTEMBER 20: People participating during the Climate Change March at Mandi House to Jantar Mantar on September 20, 2014 in New Delhi, India. The march is a global movement with participation of college students, kids, other civil society allies, young professionals, rights groups, resident welfare associations and farming communities. The march is set up ahead of United Nations Summit on Climate change in New York on September 23 lead by UN Secretary General Mr. Ban Ki Moon. (Photo by Sonu Mehta/Hindustan Times via Getty Images)
NEW DELHI, INDIA - SEPTEMBER 20: People participating during the Climate Change March at Mandi House to Jantar Mantar on September 20, 2014 in New Delhi, India. The march is a global movement with participation of college students, kids, other civil society allies, young professionals, rights groups, resident welfare associations and farming communities. The march is set up ahead of United Nations Summit on Climate change in New York on September 23 lead by UN Secretary General Mr. Ban Ki Moon. (Photo by Sonu Mehta/Hindustan Times via Getty Images)
NEW DELHI, INDIA - SEPTEMBER 20: People participating during the Climate Change March at Mandi House to Jantar Mantar on September 20, 2014 in New Delhi, India. The march is a global movement with participation of college students, kids, other civil society allies, young professionals, rights groups, resident welfare associations and farming communities. The march is set up ahead of United Nations Summit on Climate change in New York on September 23 lead by UN Secretary General Mr. Ban Ki Moon. (Photo by Sonu Mehta/Hindustan Times via Getty Images)
NEW DELHI, INDIA - SEPTEMBER 20: People participating during the Climate Change March at Mandi House to Jantar Mantar on September 20, 2014 in New Delhi, India. The march is a global movement with participation of college students, kids, other civil society allies, young professionals, rights groups, resident welfare associations and farming communities. The march is set up ahead of United Nations Summit on Climate change in New York on September 23 lead by UN Secretary General Mr. Ban Ki Moon. (Photo by Sonu Mehta/Hindustan Times via Getty Images)
NEW DELHI, INDIA - SEPTEMBER 20: People participating during the Climate Change March at Mandi House to Jantar Mantar on September 20, 2014 in New Delhi, India. The march is a global movement with participation of college students, kids, other civil society allies, young professionals, rights groups, resident welfare associations and farming communities. The march is set up ahead of United Nations Summit on Climate change in New York on September 23 lead by UN Secretary General Mr. Ban Ki Moon. (Photo by Sonu Mehta/Hindustan Times via Getty Images)
NEW DELHI, INDIA - SEPTEMBER 20: People participating during the Climate Change March at Mandi House to Jantar Mantar on September 20, 2014 in New Delhi, India. The march is a global movement with participation of college students, kids, other civil society allies, young professionals, rights groups, resident welfare associations and farming communities. The march is set up ahead of United Nations Summit on Climate change in New York on September 23 lead by UN Secretary General Mr. Ban Ki Moon. (Photo by Sonu Mehta/Hindustan Times via Getty Images)
ISTANBUL, TURKEY - 2014/09/20: Hundreds of people have marched in Istanbul as part of a worldwide protests demanding action on climate change. (Photo by Basin Foto Ajansi/LightRocket via Getty Images)
ISTANBUL, TURKEY - 2014/09/20: Hundreds of people have marched in Istanbul as part of a worldwide protests demanding action on climate change. (Photo by Basin Foto Ajansi/LightRocket via Getty Images)
ISTANBUL, TURKEY - 2014/09/20: Hundreds of people have marched in Istanbul as part of a worldwide protests demanding action on climate change. (Photo by Basin Foto Ajansi/LightRocket via Getty Images)
NEW DELHI, INDIA - SEPTEMBER 20: People participating during the Climate Change March at Mandi House to Jantar Mantar on September 20, 2014 in New Delhi, India. The march is a global movement with participation of college students, kids, other civil society allies, young professionals, rights groups, resident welfare associations and farming communities. The march is set up ahead of United Nations Summit on Climate change in New York on September 23 lead by UN Secretary General Mr. Ban Ki Moon. (Photo by Sonu Mehta/Hindustan Times via Getty Images)
RIO DE JANEIRO, BRAZIL - 2014/09/18: Christ the Redeemer iconic statue is lit up with symbolic warnings about the dangers of climate change, an international campaign to warn the locals about climate change that began on Thursday, September 18th. (Photo by Fabio Teixeira/Pacific Press/LightRocket via Getty Images)
RIO DE JANEIRO, BRAZIL - 2014/09/18: Christ the Redeemer iconic statue is lit up with symbolic warnings about the dangers of climate change, an international campaign to warn the locals about climate change that began on Thursday, September 18th. (Photo by Fabio Teixeira/Pacific Press/LightRocket via Getty Images)
RIO DE JANEIRO, BRAZIL - 2014/09/18: Christ the Redeemer iconic statue is lit up with symbolic warnings about the dangers of climate change, an international campaign to warn the locals about climate change that began on Thursday, September 18th. (Photo by Fabio Teixeira/Pacific Press/LightRocket via Getty Images)
Climate protesters hold banners on September 21, 2014 in Bordeaux during a demonstration to fight climate change. Green groups are staging climate marches in various cities worldwide prior to the UN Climate Summit taking place in New York on September 23. AFP PHOTO MEHDI FEDOUACH (Photo credit should read MEHDI FEDOUACH/AFP/Getty Images)
A climate protester holds a banner reading 'Don't worry, when we will run out of water, we will still have coca-cola' on September 21, 2014 in Bordeaux during a demonstration to fight climate change. Green groups are staging climate marches in various cities worldwide prior to the UN Climate Summit taking place in New York on September 23. AFP PHOTO MEHDI FEDOUACH (Photo credit should read MEHDI FEDOUACH/AFP/Getty Images)
A child holds a banner reading 'Mummy, can I go play outside ?' on September 21, 2014 in Bordeaux during a demonstration to fight climate change. Environmental groups are staging climate marches in various cities worldwide prior to the UN Climate Summit taking place in New York on September 23. AFP PHOTO MEHDI FEDOUACH (Photo credit should read MEHDI FEDOUACH/AFP/Getty Images)
Climate protesters gather on the Republique's square during a demonstration to fight climate change, on September 21, 2014 in Paris. AFP PHOTO / FRANCOIS GUILLOT (Photo credit should read FRANCOIS GUILLOT/AFP/Getty Images)
Climate protesters hold a banner reading ' Earth is the only planet with chocolate, preserve it 'on the Republique's statue during a demonstration to fight climate change, on September 21, 2014 in Paris. AFP PHOTO / FRANCOIS GUILLOT (Photo credit should read FRANCOIS GUILLOT/AFP/Getty Images)
A climate protester wearing a Guy Fawkes mask holds a banner reading ' World leaders act!' on the Republique's statue during a demonstration to fight climate change, on September 21, 2014 in Paris. AFP PHOTO / FRANCOIS GUILLOT (Photo credit should read FRANCOIS GUILLOT/AFP/Getty Images)
Indian protestors take part in the People's Climate March ahead of the UN Climate Summit, to demand progress in the faltering talks, in New Delhi on September 20, 2014. Green groups are staging climate marches in various cities worldwide prior to the UN Climate Summit taking place in New York on September 23. AFP PHOTO/SAJJAD HUSSAIN (Photo credit should read SAJJAD HUSSAIN/AFP/Getty Images)
Indian protestors take part in the People's Climate March ahead of the UN Climate Summit, to demand progress in the faltering talks, in New Delhi on September 20, 2014. Green groups are staging climate marches in various cities worldwide prior to the UN Climate Summit taking place in New York on September 23. AFP PHOTO/SAJJAD HUSSAIN (Photo credit should read SAJJAD HUSSAIN/AFP/Getty Images)
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Celebrities in London including actress Emma Thompson and musician Peter Gabriel joined thousands of people crossing the capital's center, chanting: "What do we want? Clean energy. When do we want it? Now."

"This is important for every single person on the planet, which is why it has to be the greatest grass roots movement of all time," Thompson said. "This is the battle of our lives. We're fighting for our children."

In New York, a contingent came from Moore, Oklahoma, where a massive tornado killed 24 people last year, as did hundreds of people affected by Superstorm Sandy, which the U.S. National Oceanic and Atmospheric Administration and the British meteorological office said was made more likely by climate change.

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. Abbott's center-right coalition has removed a carbon tax and has restricted funding for climate change bodies since coming to power last year.

Thousands March in NYC Over Climate Change

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