City methane emissions are rising faster than estimated

Urban emissions of methane—a potent greenhouse gas—are rising faster than “bottom-up” accounting estimates anticipated, according to a new study.

The discrepancy was found with satellite measurements of methane over 92 major cities around the world. For 72 of the cities, there were sufficient data to track changes in methane emissions between 2019 and 2023. Overall, global urban methane emissions...