Shanghai, Tokyo, New York, Houston spew most greenhouse gas of world cities

A motorist drives past the CHS oil refinery Sept. 28, 2024, in McPherson, Kan. Pumpjacks operate in a milo field, Monday, Sept. 30, 2024, near Hays, Kan.

Cities in Asia and the United States emit the most heat-trapping gas that feeds climate change, with Shanghai the most polluting, according to new data that combines observations and artificial intelligence.