US President Joe Biden will arrive at the COP27 conference on Friday where delegates expect him to try to pump up global ambition to fight climate change. His visit is the first stop in a packed week-long trip to grapple with some of the United States’ thorniest foreign policy issues. Biden’s speech in Sharm El-Sheikh will remind countries to stay focused on the goal of limiting global warming to 1.5 degrees Celsius. He will also discuss the importance of public-private partnership and detail US efforts to decarbonise and lower methane emissions. Among announcements likely timed for his arriva…