David Sandalow, the US assistant secretary of energy, said the continuation of business as usual in China would result in a 2.7C rise in temperatures even if every other country slashed greenhouse gas emissions by 80%."China can and will need to do much more if the world is going to have any hope of containing climate change," said Sandalow, who is in Beijing as part of a senior negotiating team aiming to find common ground ahead of the crucial Copenhagen summit at the end of this year."No effective deal will be possible without the US and China, which together account for almost half of the planet's carbon emissions."