The world’s most polluting cities revealed at COP29

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.

Nations at United Nations 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.

Seven states or provinces spew more than one billion metric tonnes of greenhouse gases, all of them in China, except Texas, which ranks sixth, according to new data from an organisation co-founded by former US Vice President Al Gore and released Friday at COP29.

Using satellite and ground observations, supplemented by artificial intelligence to fill in gaps, Climate Trace sought to quantify 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 tonnes 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.

Plenty of big cities emit far more than some nations.

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

“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, sulphur 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.

On Friday, former UN secretary-general Ban Ki-moon, former UN climate chief Christina Figueres and leading climate scientists released a letter calling for “an urgent overhaul” on climate talks.

The letter said the “global climate process has been captured and is no longer fit for purpose” in response to Azerbaijan’s president Ilham Aliyev saying that oil and gas are a “gift of the gods”.

UN Environment Programme Executive Director Inger Andresen said she understands much of the frustration in the letter calling for massive reform of the negotiation process, but said their push to slash emissions fits nicely with UN Secretary-General Antonio Guterres’ constant prodding.

One key benefit of the UN climate talks process is it is the only place where victim small island nations have an equal seat at the table, Andersen told The Associated Press. But the process has its limits because “the rules of the game are set by member states,” she said.

An analysis from the Kick Big Polluters Out coalition said Friday that the official attendance list of the talks featured at least 1,770 fossil fuel lobbyists.

Gore criticised the hosting of climate talks by Azerbaijan, an oil nation and site of the world’s first oil wells, and by the United Arab Emirates last year.

“It’s unfortunate that the fossil fuel industry and the petrostates have seized control of the COP process to an unhealthy degree,” Gore said.

At a press conference with small island nations, chair Cedric Schuster said the negotiating bloc feels the need to remind everyone else why the talks matter.

“We’re here to defend the Paris agreement,” Schuster said, referring to the climate deal in 2015 to limit warming to 1.5 degrees Celsius (2.7 degrees Fahrenheit). “We’re concerned that countries are forgetting that protecting the world’s most vulnerable is at the core of this framework.”

– AP