Guardian: Bilateral talks between the US and China will not replace the need for a global climate deal at Copenhagen, according Barack Obama’s most senior science adviser. John Holdren also said that, though there was much legislative work still to do in Congress, he was confident the US would be in a position to sign up to a successor to the Kyoto Protocol by the end of the year and would do it within the United Nations framework. “There are a lot of conversations going on with China and those …