Leonardo DiCaprio, Mark Ruffalo and Edward Norton join climate change march

Leonardo DiCaprio, Mark Ruffalo, Susan Sarandon and Edward Norton joined thousands of eco-activists on the streets of New York City on Sunday (21Sep14) to demand more action on climate change.

Joseph Gordon-Levitt, acting couple Kevin Bacon and Kyra Sedgwick, Evangeline Lilly, and rocker Sting and his producer wife Trudi Styler also took part in the Big Apple leg of the People's Climate Change march.

Sedgwick took to her Twitter.com blog during the demonstration and declared, "Today I march (for) the future. #ActOnClimate (Our) only hope is to ban (sic) together And demand change", while actor John Leguizamo revealed his teenage child had also joined in, writing, "My daughter went to protest for global warming counter programing! 14 and already an activist! So proud".

The event attracted as many as 300,000 people and was billed as the biggest march for climate change action in history.

After the march, Ruffalo tweeted, "The #PeopleClimateMarch today was undeniably a historic moment in the fight against #climatechange ignorance 310k people strong!"

Other People's Climate Change demonstrations also took place in cities including Paris, France, Melbourne, Australia and London, where campaigners included Harry Potter co-stars Emma Thompson and Bonnie Wright.

The marches were planned to raise awareness about the cause ahead of the United Nation's climate change summit in New York on Tuesday (23Sep14), where new U.N. Messenger of Peace on Climate Change DiCaprio will address attendees.