Good afternoon and welcome to the bbc news at one. Temperatures across the world in september were the warmest on record, breaking the previous high by a huge margin, according to the eu climate service. The heat is being driven by ongoing emissions of gases warming the atmosphere, as well as the Weather Event known as el nino. They say 2023 is now on track to be the warmest on record. Our climate editor, justin rowlatt, is here. This sounds very sobering . It is sobering. September was 0. 93 celsius warmer than the average global temperature for the month, so almost a whole degrees celsius, huge margin when you remember it is an average across the whole globe. Normally we would expect variations of a small fraction of a degree between years and it comes after, as you said, the hottest Northern Hemisphere summer on record. July we saw the hottest day, then the hottest week, then the hottest month ever recorded with scientist saying they thought it was almost certainly they thought it w