British Prime Minister Gordon Brown has called for $30bn (£18.32bn) to be set aside to help the world’s poorest countries adapt to the effects of climate change.

Speaking at the United Nations in New York, Brown said that climate change was a ‘terrible injustice’ which was hitting the world’s most vulnerable nations the hardest.

Brown has already proposed a $100bn (£61bn) international package to help the world’s developing nations use renewable sources of power and cleaner technologies.

But in opening remarks to a UN working group on the financing of an agreement, he said that of the $100bn total, $30bn would be needed specifically for the poorest countries in the world.

“Climate change is a terrible injustice – it has been caused almost entirely by the richest countries, but its earliest and most damaging effects will fall, and are already falling, on the poorest,” Brown said.

The working group was part of a climate change summit called by UN Secretary General Ban Ki moon ahead of climate change talks in Copenhagen in December.