A Guardian report on a Climate Action Tracker analysis warns the world is heading for an irrecoverable overshoot of the 1.5C threshold, which it says will be breached within a few years, with 2.7C of heating by 2100 under current policies. Delegates at UN talks in Antalya, joined by Greta Thunberg, face calls from António Guterres and Bill Hare to phase out fossil fuels.