Leaders of the world’s largest economies have reached an agreement to tackle the global financial crisis with measures worth $1.1 trillion (£681bn).
To help countries with troubled economies, the resources available to the International Monetary Fund (IMF) will be tripled to $750bn.
There will also be sanctions against secretive tax havens and tougher global financial regulation.
And the G20 has committed about $250bn to boost global trade.
US President Barack Obama said the summit could mark a “turning point” in the pursuit of economic recovery and made progress in reforming a “failed regulatory system”.
By any measure the London summit was historic.
“It was historic because of the size and the scope of the challenges that we face and because of the timeliness and the magnitude of our response,” he said.
Prime Minister Gordon Brown said there was “no quick fix” for the world economy but there was a commitment to do whatever was necessary.
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