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Mon 11 Nov 2007UN urges US, China to lead on global warmingUN secretary general Ban Ki-Moon has called on the US and China to play a more constructive role in combating climate change ahead of crucial talks on a new global climate treaty next month.He also warned that changing weather and temperature patterns - which he described as the "defining challenge of our age" - threatened to push developing nations into a poverty trap unless there was a deal to curb CO2 emissions.