This year's U.N. climate summit delivered a deal on climate finance two days past deadline, after two weeks of tense negotiations. Here are some of the takeaways from the COP29 summit held in Azerbaij

Baku, Azerbaijan —Azerbaijan is the land of fire, or so the Zoroastrian legend goes. Its supply of combustible fuel has long bound this story to Azerbaijan’s reality. One of its natural wonders is a “burning mountain,” Yanar Dagh, which blazes continuously from hydrocarbon gases venting from inside the earth.

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.