Shanghai, Tokyo, New York, Houston spew the most greenhouse gas among the world's cities

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.

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Nations at U.N. climate talks in Baku, Azerbaijan are trying to set new targets to cut such emissions and figure out how much rich nations will pay to help the world with that task. The data comes as climate officials and activists alike are growing increasingly frustrated with what they see as the talks’—and the world’s—inability to clamp down on planet-warming fossil fuels and the countries and companies that promote them.