the final goal is to bring the world together to deliver . this is focused on governments collaborating, as well as businesses and civil society, in order to finalise what s known as the paris rulebook the detailed rules agreed in the paris climate accord in 2015. so they are the goals that ll be at the heart of negotiations over the next 12 days or so. the challenge will be getting nearly every country in the world, all with their own individual set of circumstances, to agree on a common pathway forward. it s hoped that agreement will be reached by the end of the summit, which is next friday november 12th. although if past summits are anything to go by, things could slip into that weekend. lots to talk about already. let s speak to professor piers forster, professor of physical climate change and director of the priestley international centre for climate at the university of leeds. really good to have you with us. i