While US president-elect Donald Trump doesn’t formally take up office until 20 January, he is very much the elephant in the room at the Conference of the Parties (COP) 29th summit, which opened in Azerbaijan this week. This gathering is not being attended by several global leaders including the presidents of the US, China and the European Commission, as well as the leaders of several European countries. This has meant that COP29 is on course to be a relatively low-key event without the political heft that comes from having global leaders present.