Political shenanigans, unrealistically lofty ambitions on financing and economies digging their heels on fossil fuels largely upended possibility of consensus at COP29.

The COP29 summit in Azerbaijan is being extended as difficult negotiations over climate finance continue. The talks in Baku had been scheduled to end at 6 pm (1400 GMT) on Friday. Financial pledges to poorer countries to help them cut emissions have been at the centre of intense discussions,

COPs have been getting progressively longer; the excellent team at Carbon Brief extrapolated the trend line, which suggests COP29 will end in the small hours of Sunday morning. Even that may be optimistic.

The main goal of COP29 is to agree how much money richer developed countries will provide poorer developing ones to help them fight climate change.