The world creates 57 million tons of plastic pollution every year and spreads it from the deepest oceans to the highest mountaintops to the inside of people's bodies, according to a new study that also said more than two-thirds of it comes from the Global South.

It's enough pollution each year – about 52 million metric tons – to fill New York City’s Central Park with plastic waste as high as the Empire State Building, according to researchers at the University of Leeds in the U.K. They examined waste produced locally at more than 50,000 cities and towns worldwide for a study in Wednesday’s journal Nature.

The study examined plastic that goes into the open environment, not plastic that goes into landfills or is properly burned. For 15% of the world's population, the government fails to collect and dispose of waste, the study's authors said – a big reason Southeast Asia and Sub-Saharan Africa produce the most plastic waste. That includes 255 million people in India, the study said.

According to study author Costas Velis, a Leeds environmental engineering professor, the city of Lagos, Nigeria emitted the most plastic pollution of any city. The other biggest plastic-polluting cities are New Delhi, Luanda, Angola, Karachi, Pakistan and Al Qahirah, Egypt.

India leads the world in generating plastic pollution, producing 10.2 million tons a year (9.3 million metric tons), far more than double the next big polluters, Nigeria and Indonesia. China, often villainized for pollution, ranks fourth but is making tremendous strides in reducing waste, Velis said. Other top plastic polluters are Pakistan, Bangladesh, Russia and Brazil. Those eight nations are responsible for more than half of the globe's plastic pollution, according to the study's data.

The U.S. ranks 90th in plastic pollution with more than 52,500 tons (47,600 metric tons) and the U.K. ranks 135th with nearly 5,100 tons (4,600 metric tons), according to the study.

In 2022, most of the world’s nations agreed to make the first legally binding treaty on plastics pollution, including in the oceans. Final treaty negotiations will take place in South Korea in November.

The study used artificial intelligence to concentrate on improperly burned plastics – about 57% of the pollution – or plastic that is just dumped. In both cases, incredibly tiny microplastics, or nanoplastics, are what turn the problem from a visual annoyance at beaches and a marine life problem to a human health threat, Velis said.

Several studies this year have looked at how prevalent microplastics are in our drinking water and people's tissue, such as hearts, brains and testicles, but doctors and scientists are still not quite sure what it means regarding human health threats.

"The big time bomb of microplastics is the fact that they are mainly released in the Global South," Velis said. "We already have a massive dispersal problem. Microplastics are found in the most remote places: the peaks of Everest, the Mariana Trench in the ocean and even in what we breathe, eat and drink."

He called it "everybody's problem" and one that will haunt future generations.

"We shouldn't put the blame, any blame, on the Global South," Velis said. "And we shouldn't praise ourselves about what we do in the Global North in any way."

"It's just a lack of resources and ability of government to provide the necessary services to citizens," Velis said.

Outside experts worried that the study's focus on pollution, rather than overall production, lets the plastics industry off the hook. Plastics emit large amounts of greenhouse gases that contribute to climate change.

"These guys have defined plastic pollution in a much narrower way, as really just macroplastics that are emitted into the environment after the consumer, and it risks us losing our focus on the upstream and saying, hey now all we need to do is manage the waste better," said Neil Tangri, senior director of science and policy at GAIA, a global network of advocacy organizations working on zero waste and environmental justice initiatives. "It’s necessary, but it’s not the whole story."

Theresa Karlsson, science and technical advisor to International Pollutants Elimination Network, another coalition of advocacy groups on environment, health and waste issues, called the volume of pollution identified by the study "alarming" and said it shows the number of plastics being produced today is "unmanageable."

However, she said the study misses the significance of the global trade in plastic waste that has rich countries sending it to poor ones. The study said plastic waste trade is decreasing, with China banning waste imports. But Karlsson said overall waste trade is actually increasing and likely plastics with it. She cited EU waste exports going from 110,000 tons (100,000 metric tons) in 2004 to 1.4 million tons (1.3 million metric tons) in 2021.

Velis said the amount of plastic waste traded is small. Kara Lavender Law, an oceanography professor at the Sea Education Association who wasn't involved in the study, agreed, based on U.S. plastic waste trends. She said this was otherwise one of the more comprehensive studies on plastic waste. Officials in the plastics industry praised the study.

"This study underscores that uncollected and unmanaged plastic waste is the largest contributor to plastic pollution and that prioritizing adequate waste management is critical to ending plastic pollution," Chris Jahn, council secretary of the International Council on Chemical Associations, said in a statement. In treaty negotiations, the industry opposes a cap on plastic production.

The United Nations projects that plastics production is likely to rise from about 440 million tons (400 million metric tons) a year to more than 1,200 million tons (1,100 million metric tons), saying "our planet is choking in plastic."