Producers and consumers must share burden of global plastic packaging waste

The Great Pacific Garbage Patch, an area twice size of Texas, consists of plastic waste from all over the world, carried by currents to converge in the Pacific Ocean near Hawaii. The floating waste breaks down into microplastics, which are consumed by fish and in turn by humans who eat those fish.

Only about 14.5% of U.S. plastic waste is recycled; most ends up in landfills where it takes hundreds of years to degrade. The U.S. and other developed countries have traditionally shipped their plastic waste to Asia, but many developing countries now refuse to accept more waste.

A new study by an international team of researchers explores the global patterns of plastic packaging waste. The study finds three countries -- the U.S., Brazil, and China -- are the top suppliers of waste.

"We wanted to follow the plastic packaging waste embedded in the global supply chain. This work allows us to conclude the problem is a responsibility shared between economic agents, from the producers and their intermediaries to the retail stores and the consumers," says study co-author Sandy Dall'erba, professor in the Department of Agricultural and Consumer Economics (ACE) and director of the Center for Climate, Regional, Environmental and Trade Economics (CREATE) at the University of Illinois.

Dall'erba and his colleagues measured plastic packaging waste transaction flows based on a global, multiregional input-output database called EXIOBASE, combined with World Bank data.

The researchers found North and South America together generate 41% of the world's production of plastic packaging waste, mostly from the U.S. (19% of world production) and Brazil (13%). Europe is next with 24%, and Asia follows with 21%, most of which is generated in China (12%).

When looking at consumers, North and South America are again responsible for the most waste. Combined, the Americas represent 36% of the world plastic packaging consumption, followed by Asia at 26% and Europe at 23%.

"High-protein food such as meat, fish, and dairy is a trademark in the Americas and those generate a lot of plastic packaging waste," Dall'erba explains. "For instance, every 1 kg (2.2 lbs.) of fish consumed will lead to an average of about 1.6 kg (2.5 lbs.) waste. This includes plastic bags, trays, and cellophane used to wrap and cover the fish during transportation, storage, and sales."

International exports further exacerbate the problem, accounting for about 25% of global plastic packaging waste.

"Plastic is not easy to replace. There is no other material to protect the freshness of a food product that will be shipped around the world," he states. "We need to further develop technologies that make plastics more biodegradable, such as products based on algae. But we also need stricter regulations to discourage plastic packaging production and use."

International agreements such as the Kyoto Protocol typically focus on restrictions and fees on production. But that gives developed countries a strong incentive to relocate their most polluting activities to developing countries. At the world level, it's a zero-sum game, because you just delegate the problem to another place, Dall'erba notes.

The researchers conclude producers and consumers must share responsibility and costs.

"All agents along the supply chain and final consumers need incentives to reduce plastic use. Some examples are taxes on waste management or refunds for returning plastic bottles," explains Xiang Gao, the paper's lead author. Gao is a researcher at the Academy of Mathematics and Systems Science, Chinese Academy of Sciences (CAS) in Beijing, China.

"Other steps include banning of single-use plastic straws, or imposing fees for grocery store plastic bags," he adds. "Consuming locally grown, seasonal food would help, and so would better transparency about the true recyclability associated with the resin identification code stamped on plastic packaging."

Gao started working on the research while he was a visiting scholar in Dall'erba's research group at U of I. Other co-authors include Cuihong Yang, professor at the Academy of Mathematics and Systems Science, CAS; Andre Avelino, researcher at the National Renewable Energy Laboratory; and Brenna Ellison, professor in agricultural economics at Purdue University.

The Department of Agricultural and Consumer Economics and the Center for Climate, Regional, Environmental and Trade Economics (CREATE) are in the College of Agricultural, Consumer and Environmental Sciences, University of Illinois.

This research was supported by the Department of Agricultural and Consumer Economics, the Center for Climate, Regional, Environmental and Trade Economics (CREATE), and the National Natural Science Foundation of China and the Chinese Scholarship Council.