The world now needs change it can believe in. Only Barack Obama, the US president, can provide the desired leadership: he is untainted, popular and leader of the country that, for good and ill, remains central.
The opportunity for Mr Obama is now, as the G20 “sherpas” prepare the draft text. He needs to write urgently to his fellow heads of government. Something like this would be perfect.
“My fellow leaders, Franklin Delano Roosevelt abandoned his London summit. I wish to make ours the moment at which we save ourselves. Let us resolve to bequeath renewed prosperity to posterity, not a collapse of the global economy we inherited.
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