Organisers claim more than 300,000 people turned out for a march in New York yesterday, marking the largest climate change rally in history.

The rally was part of a global day of action in over 150 countries which saw about a thousand people take to the streets in Dublin.

Activists want world leaders to agree to cut emissions at the summit which gets underway on Tuesday in New York.

Russell Brand outlined why we should take climate change seriously in this video:

Joining the crowds were actors Leonardo DiCaprio as well as Mark Ruffalo who says conflicting interests over oil and gas is causing instability around the world: