Plastic is forever

Well, not quite forever, but it might as well be. The average piece of plastic that passes through your hands will last hundreds of years.

And when you throw it away, you think it's just gone. But in reality, so much of humanity's plastic waste simply washes up somewhere else... or floats on the ocean for months or years or ???

The poisons that collect on plastic, as well as the toxins in the polymers themselves, end up in the ocean food chain, ultimately completing a grand round trip by coming back to us in the seafood we consume.

The New York Times had a great article today about the problem. The problem affects even the most remote areas of the planet, far from human habitation:

In 2004 two oceanographers from the British Antarctic Survey completed a study of plastic dispersal in the Atlantic that spanned both hemispheres. “Remote oceanic islands,” the study showed, “may have similar levels of debris to those adjacent to heavily industrialized coasts.” Even on the shores of Spitsbergen Island in the Arctic, the survey found on average a plastic item every five meters.

Where does it all come from? It comes from you and me:

Not even oceanographers can tell us exactly how much floating scruff is out there; oceanographic research is simply too expensive and the ocean too varied and vast. In 2002, Nature magazine reported that during the 1990s, debris in the waters near Britain doubled; in the Southern Ocean encircling Antarctica the increase was a hundredfold. And depending on where they sample, oceanographers have found that between 60 and 95 percent of today’s marine debris is made of plastic.

Plastic gets into the ocean when people throw it from ships or leave it in the path of an incoming tide, but also when rivers carry it there, or when sewage systems and storm drains overflow. Despite the Ocean Dumping Reform Act, the U.S. still releases more than 850 billion gallons of untreated sewage and storm runoff every year, according to a 2004 E.P.A. report. Comb the Manhattan waterfront and you will find, along with the usual windrows of cups, bottles and plastic bags, what the E.P.A. calls “floatables,” those “visible buoyant or semibuoyant solids” that people flush into the waste stream like cotton swabs, condoms, tampon applicators and dental floss. [emphasis added]

The Encyclopedia of Coastal Processes, about as somniferously clinical a scientific source on the subject as one can find, predicts that plastic pollution “will incrementally increase through the 21st century,” because “the problems created are chronic and potentially global, rather than acute and local or regional as many would contemplate.” The problems are chronic because, unlike the marine debris of centuries past, commercial plastics do not biodegrade in seawater. Instead, they persist, accumulating over time, much as certain emissions accumulate in the atmosphere. The problems are global because the sources of plastic pollution are far-flung but also because, like emissions riding the winds, pollutants at sea can travel.

Amazingly, huge amounts of floating plastic congregate out in the open waters of the oceans:

“As I gazed from the deck at the surface of what ought to have been a pristine ocean,” [researcher Charles] Moore later wrote in an essay for Natural History, “I was confronted, as far as the eye could see, with the sight of plastic. It seemed unbelievable, but I never found a clear spot. In the week it took to cross the subtropical high, no matter what time of day I looked, plastic debris was floating everywhere: bottles, bottle caps, wrappers, fragments.” An oceanographic colleague of Moore’s dubbed this floating junk yard “the Great Pacific Garbage Patch,” and despite Moore’s efforts to suggest different metaphors — “a swirling sewer,” “a superhighway of trash” connecting two “trash cemeteries” — “Garbage Patch” appears to have stuck.

The Garbage Patch wasn’t merely a cosmetic problem, nor merely a symbolic one, Moore contended. For one thing, it was a threat to wildlife. Scientists estimate that every year at least a million seabirds and 100,000 marine mammals and sea turtles die when they entangle themselves in debris or ingest it. “Entanglement and ingestion, however, are not the worst problems caused by the ubiquitous plastic pollution,” Moore wrote. Plastic polymers, as has long been known, absorb hydrophobic chemicals, including persistent organic pollutants, or POPS, like dioxin, P.C.B.’s and D.D.T. Highly controlled in the U.S. but less so elsewhere, such substances are surprisingly abundant at the ocean’s surface. By concentrating these free-floating contaminants, Moore worried, particles of plastic could become “poison pills.” He also worried about toxins in the plastic itself — phthalates, organotins — that have been known to leach out over time. Once fish or plankton ingest these pills, Moore speculated, poisons both in and on the plastic would enter the food web. And since such toxins concentrate, or “bioaccumulate,” in fatty tissues as they move up the chain of predation — so that the “contaminant burden” of a swordfish is greater than a mackerel’s and a mackerel’s greater than a shrimp’s — this plastic could be poisoning people too.

And what are we to do?

As nearly everyone I spoke to about marine debris agrees, the best way to get trash out of our waterways is, of course, to keep it from entering them in the first place. But experts disagree about what that will take. The argument, like so many in American politics, pits individual freedom against the common good. “Don’t you tell me I can’t have a plastic bag,” Seba Sheavly, the marine-debris researcher, says, alluding to plastic-bag bans like the one San Francisco enacted last year. “I know how to dispose of it responsibly.” But proponents of bag bans insist that there is no way to use a plastic bag responsibly. Lorena Rios, an environmental chemist at the University of the Pacific, says: “If you go to Subway, and they give you the plastic bag, how long do you use the plastic bag? One minute. And how long will the polymers in that bag last? Hundreds of years...." [emphasis added]

We still have limited tax dollars to spend and scarier nightmares to fear. No one... will tell you that plastic pollution is the greatest man-made threat our oceans face. Depending whom you ask, that honor goes to global warming, agricultural runoff or overfishing. But unlike many pollutants, plastic has no natural source and therefore there is no doubt that we are to blame. Because we can see it, plastic is a powerful bellwether of our impact upon the earth. Where plastics travel, invisible pollutants — pesticides and fertilizers from lawns and farms, petrochemicals from roads, sewage tainted with pharmaceuticals — often follow.

So the next time you handle something made of plastic, think about how long you will use it, how long it will last once you've discarded it, and where it may spend those centuries.