Hundreds of thousands of people have marched worldwide to demand action to stop climate change, the day before a UN summit starts in Paris.

Pairs of shoes are symbolically placed on the Place de la Republique, after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. REUTERS/Eric Gaillard

The Eiffel Tower lit up green on Sunday evening. EPA

Indigenous children depict fish in the sea during a rally held the day before the start of the Paris Climate Change Conference (COP21), in Sao Paulo, Brazil, November 29, 2015. REUTERS/Nacho Doce

Protesters take part in a rally held a day before the start of the 2015 Paris Climate Change Conference (COP21), on Parliament Hill in Ottawa, Canada, November 29, 2015. REUTERS/Chris Wattie

Protesters dressed as Santa Claus take part in a protest about climate change at New York City Hall steps in lower Manhattan, New York, November 29, 2015, a day before the start of the Paris Climate Change Conference (COP21). REUTERS/Eduardo Munoz

A protester dressed in police uniform takes part in a protest about climate change around New York City Hall at lower Manhattan, New York, November 29, 2015, a day before the start of THE Paris Climate Change Conference (COP21). REUTERS/Eduardo Munoz

People take part in a protest about climate change around New York City Hall at lower Manhattan, New York, November 29, 2015, a day before the start of the Paris Climate Change Conference (COP21). REUTERS/Eduardo Munoz

An activist takes part in a rally held the day before the start of the Paris Climate Change Conference (COP21), in San Jose, Costa Rica, November 29, 2015. REUTERS/Juan Carlos Ulate

Protesters throw up a globe-shaped balloon during a rally held the day before the start of the 2015 Paris World Climate Change Conference, known as the COP21 summit, in Rome, Italy, November 29 2015. REUTERS/Alessandro Bianchi

A Greenpeace activist dressed as a bear holds up a banner during a rally held the day before the start of the Paris Climate Change Conference (COP21), in Mexico City, Mexico November 29, 2015. The banner reads, "Climate Change". REUTERS/Daniel Becerril

Climate change demonstrators listen to speeches at the end of a march to demand curbs to carbon pollution in London on November 29, 2015. AFP/AFP

A man rides his bicycle while carrying an Alebrije as he takes part in a rally held the day before the start of the 2015 Paris Climate Change Conference (COP21), in Mexico City, Mexico November 29, 2015. REUTERS/Daniel Becerril

People hold placards and banners as they participate in a march ahead of the Paris World

A woman holds a sign during the Global Climate March in Santiago on November 29. Picture: AFP/Martin Bernetti

The main talks in Paris get under way on Monday. AFP/Getty Images

Demonstrators clash with CRS riot policemen near the Place de la Republique after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. REUTERS/Eric Gaillard

Activists wearing gas mask replicas hold placards during in a rally held the day before the start of the Paris Climate Change Conference (COP21), in La Paz, Bolivia, November 29, 2015. The placard reads, "If you want to keep living, your surroundings have to continue to exist". REUTERS/David Mercado

A pair of beach sandals with green moss are symbolically placed on the Place de la Republique, after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. REUTERS/Eric Gaillard

An activist who holds a big replica of a coca leaf leads a rally held a day before the start of the Paris Climate Change Conference (COP21), in La Paz, Bolivia, November 29, 2015. The signs (in red) reads, "not cutting down more trees". REUTERS/David Mercado

Protesters lie next to signs reading "I am the Doce river" during a rally held the day before the start of the Paris Climate Change Conference (COP21), in Rio de Janeiro, Brazil, November 29, 2015. REUTERS/Pilar Olivares

The protest in Rio de Janeiro involved plenty of mud. Image EPA

Demonstrators gather in Berlin as part of the global day of climate action ahead of COP21 in Paris. | Photo: Reuters

A protester dressed as a bear takes part in a rally held the day before the start of the 2015 Paris World Climate Change Conference, known as the COP21 summit, in Rome, Italy, November 29, 2015. REUTERS/Alessandro Bianchi

Protesters shout slogans carrying a sign during a rally held the day before the start of the Paris Climate Change Conference (COP21), in Rio de Janeiro, Brazil, November 29, 2015. The sign reads, "Zero Deforestation." REUTERS/Pilar Olivares

An environmentalist reacts in front of French CRS police near the Place de la Republique after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. REUTERS/Benoit Tessier

A melting planet in an ice cream cone carried during the climate change march in Berlin

Protesters demonstrate during a rally held the day before the start of the Paris Climate Change Summit, in London, Britain November 29, 2015. REUTERS/Suzanne Plunkett

Environmental activists take part in a symbolic human chain gathering, after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Marseille, France, November 29, 2015. REUTERS/Jean-Paul Pelissier

A woman with a polar bear hat participates in a human chain to show solidarity for climate change after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. REUTERS/Benoit Tessier

People form a human chain to show solidarity for climate change after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. The slogans read "We participate in the beauty of the world but climate warming threatens us". REUTERS/Benoit Tessier

Ladies take part in a rally for Climate change consciousness in Dhaka, Bangladesh, Saturday, Nov. 28, 2015.

A protester holds up a placard as he demonstrates during a rally held the day before the start of the Paris Climate Change Summit in Madrid, Spain, November 29, 2015. The placard reads: "The thermometer of the life, No more CO2" . REUTERS/Andrea Comas

Environmental activists participate in a human chain to show solidarity for climate change after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. REUTERS/Benoit Tessier

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