Street protests demanding urgent action on climate change have attracted hundreds of thousands of marchers in more than 2,000 locations worldwide.

The People's Climate March is campaigning for curbs on carbon emissions, ahead of the UN climate summit in New York next week.

In Manhattan, organisers said some 310,000 people joined a march that was also attended by UN chief Ban Ki-moon.

Earlier, huge demonstrations took place in Australia and Europe.

"This is the planet where our subsequent generations will live," Mr Ban told reporters. "There is no 'Plan B' because we do not have 'Planet B'."

The UN Secretary General was accompanied by primatologist Jane Goodall and the French Ecology Minister, Segolene Royal.

New York hosted the largest of Sunday's protests, drawing more than half of the 600,000 marchers estimated by organisers to have taken part in rallies around the world.

In Manhattan, Ban Ki-moon (in blue hat) was flanked by primatologist Jane Goodall (to his right) and French ecology minister Segolene Royal

Manhattan echoed to the sound of chants, horns and drums as the colourful protest progressed through the streets.

Organisers of the Manhattan event said it surpassed the largest previous protest on climate change.

They said the massive mobilisation was aimed at transforming climate change "from an environmental concern to an everybody issue".

Business leaders, environmentalists and celebrities joined the demonstration.

Hollywood actor Leonardo DiCaprio also took part, having been appointed as a UN representative on climate change last week.

Many of the marchers in New York wore costumes associated with indigenous people

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