Shanghai, Tokyo, New York, Houston Spew Most Greenhouse Gas Of World Cities

BAKU: 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 -- released Friday -- that combines observations and artificial intelligence. Seven states or provinces spew more than 1 billion metric tons of greenhouse gases, all of them in China, except Texas, which ranks sixth, according to the new data from an organisation co-founded by former US Vice President Al Gore and released at the United Nations climate talks here.

Nations at the talks 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. Using observations and artificial intelligence, Climate Trace quantifies heat-trapping carbon dioxide, methane and nitrous oxide, as well as other traditional air pollutants worldwide, including for the first time in more than 9,000 urban areas.

Earth's total carbon dioxide and methane pollution grew 0.7 per cent to 61.2 billion metric tons with the short-lived but extra potent methane rising 0.2 per cent. The figures are higher than other datasets “because we have such comprehensive coverage and we have observed more emissions in more sectors than are typically available,” said Gavin McCormick, Climate Trace's co-founder.

Shanghai's 256 million metric tons of greenhouse gases led all cities and exceeded those from the nations of Colombia or Norway. Tokyo's 250 million metric tons would rank in the top 40 of nations if it were a country, while New York City's 160 million metric tons and Houston's 150 million metric tons would be in the top 50 of countrywide emissions. Seoul, South Korea, ranks fifth among cities at 142 million metric tons.

“One of the sites in the Permian Basin in Texas is by far the No. 1 worst polluting site in the entire world,” Gore said. “And maybe I shouldn't have been surprised by that, but I think of how dirty some of these sites are in Russia and China and so forth. But Permian Basin is putting them all in the shade.” China, India, Iran, Indonesia and Russia had the biggest increases in emissions from 2022 to 2023, while Venezuela, Japan, Germany, the United Kingdom and the United States had the biggest decreases in pollution.

The dataset — maintained by scientists and analysts from various groups — also looked at traditional pollutants such as carbon monoxide, volatile organic compounds, ammonia, sulfur dioxide and other chemicals associated with dirty air. Burning fossil fuels releases both types of pollution, Gore said.

This “represents the single biggest health threat facing humanity,” Gore said.