Brown delivers stark climate warning

Gordon Brown has warned world leaders there is 'no plan B' if efforts to secure a new global climate change deal in the coming months fail.

The prime minister made the comments to the Major Economies Forum in London this morning and said the Copenhagen conference in December must be the moment when a new historic agreement is reached.

'If we do not reach a deal at this time, let us be in no doubt, once the damage from unchecked emission growth is done, no retrospective global agreement, in some future period, can undo that choice. By then it will irretrievably too late,' he said.

Mr Brown said nations could not continue to operate on a 'business as usual' basis, warning new emissions targets will require a 'high level of international cooperation'.

There are now less than 50 days until the crucial Copenhagen summit and Mr Brown said on Monday: 'If we now, we will pay a heavy price.

'If we falter the Earth will be at risk, there is no plan B.'

Mr Brown has pledged to attend the December talks personally to help secure a new climate deal.