Business Green: China today attempted to restore some much needed confidence to the UN climate change negotiations when a senior official said the government wants to sign a binding climate treaty by late 2011. The failure of last year’s UN climate change summit in Copenhagen coupled with a fractious meeting in Bonn earlier this summer has fuelled speculation that the talks will not only fail to deliver a treaty at this year’s summit in Cancun, but could implode altogether. Privately diplomats …