Microplastics are everywhere – in us too
By Sarah (Steve) Mosko
What do beer, oysters, table salt, air, and tap water have in common? They’re all ways that we humans are ingesting microplastics – tiny bits of plastic waste ubiquitous in oceans, lakes, and rivers, and even in soil and air.
Wildlife as diverse as whales, seabirds, fish, and zooplankton are polluted by ingesting plastic debris. We would be naïve to assume that humans, sharing the same global environment and eating at the top of the food chain, are magically spared contamination from plastics.
Although no one has yet measured how much plastic pollution humans actually carry around, there’s plenty of evidence we’re taking the stuff in, by eating, drinking, and just breathing.
Plastics for Dinner?
Discovery of sea life carcasses chock full of plastic waste has sparked concern that sea creatures consumed by humans are imbibing plastics too. Research reveals that visible plastic debris is taken up by life forms throughout the ocean food web, from small plankton-eating fish to shellfish, turtles, dolphins, and whales.
However, most marine plastics are invisible to the naked eye. Petroleum-based plastics resist biodegradation, but instead fragment into ever smaller pieces, eventually reaching millimeter and nanoscale dimensions dubbed microplastics. Microplastics can transfer up aquatic food chains, as demonstrated by transfer from the tiniest to larger zooplankton, and from mussels to shore crabs.
That fish and bivalves sold at fish markets worldwide contain plastic debris is proof that plastics are making their way onto our dinner plates. But plastics are also showing up in less obvious places on the dinner table.
One study reported that 36 of 39 brands of table salt brands from 16 countries/regions, including the United States, contained microplastics.
In an analysis of tap water from five continents, over 80 percent of city samples contained plastic microfibers from synthetic textiles. The U.S. samples fared the worst, with 94 percent contaminated. All 12 sampled brands of beer produced in the Great Lakes region contained microplastics, averaging four particles per liter.
How much plastic might a person imbibe? One study estimated shellfish consumers could eat 11,000 microplastic particles annually. Another figured yearly consumption of 5,800 from beer, salt, and tap water.
Plastics appear inert, but they’re not. The polymer’s chemical building blocks and the additives used to impart desired properties can be dangerous chemicals which migrate out into the surroundings. Plastics also pick up toxic chemicals from seawater. When fish consume plastics, transfer of pollutants to their tissues can occur.
That human feces contain microplastics is hard-to-deny evidence of human exposure. Degrading plastics eventually reach the microscopic dimensions of viruses that can penetrate the lung and gut and reach vital organs via the circulatory or lymphatic systems.
How is plastic getting into everything?
Less than a tenth of the nine billion tonnes of plastic ever produced worldwide has been recycled, most ending up in landfills or as litter where fragmentation ensues.
Water treatment plants weren’t designed to remove microplastics. Treated water and sewage sludge are awash in microfibers sloughed off from synthetic fabrics during laundering, which consequently pollute oceans, lakes, streams, and soils.
Air is contaminated by microplastic fibers sloughed off during normal abrasion of clothing, upholstery, and carpeting. And we’re not just breathing them in. Research suggests that humans likely consume more microplastics from the dust that invisibly rains down on their meals than from the food itself.
The solution?
The countless conveniences of “The Age of Plastics” are the product of human innovation. But we’ve also unknowingly created a deadly monster: the microplastic contamination of the global environment and ourselves.
A problem this huge requires sweeping reforms in humankind’s relationship to plastics, and the European Union is taking the lead. Its Parliament just voted a union-wide ban on common single-use plastics, like cutlery, straws, and cotton swabs. The United States must follow suit and also pressure manufacturers to re-design plastics so they’re made from sustainable, non-toxic, biodegradable, and easily recycled materials.
Sarah "Steve" Mosko is a freelance writer focused on current environmental problems and solutions. Her other published articles on the environment can be read on www.BoogieGreen.com. She’s also a psychologist and sleep disorders specialist and lives in southern California.
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