ST ANDREWS, SCOTLAND - NOVEMBER 07: Britain's Prime Minister Gordon Brown (L) talks to the Chairman of the U.S. Federal Reserve Ben Bernanke (back to camera), U.S. Treasury Secretary Timothy Geithner (R) and Danish Prime Minister Lars Lokke Rasmussen,  during a break at the G20 Finance Ministers meeting on November 7, 2009 in St Andrews, Scotland. British finance minister Alistair Darling urged his G20 counterparts on Saturday to work toward a $100 billion deal on tackling climate change as developing nations held firm they did not want to talk about it. Getty Images logo Getty Images 27 months ago

ST ANDREWS, SCOTLAND - NOVEMBER 07: Britain's Prime Minister Gordon Brown (L) talks to the Chairman of the U.S. Federal Reserve Ben Bernanke (back to camera), U.S. Treasury Secretary Timothy Geithner (R) and Danish Prime Minister Lars Lokke Rasmussen, during a break at the G20 Finance Ministers meeting on November 7, 2009 in St Andrews, Scotland. British finance minister Alistair Darling urged his G20 counterparts on Saturday to work toward a $100 billion deal on tackling climate change as developing nations held firm they did not want to talk about it.