By Kate Abnett, Valerie Volcovici and Nailia Bagirova BAKU (Reuters) -Wealthy countries raised their offer of climate finance to $300 billion a year at COP29 on Saturday, raising hopes of a deal with developing nations that had dismissed an earlier proposal as insufficient to address the impacts of global warming.

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.