Scientists have come up with a new way to measure ocean trash—and the numbers are even worse than thought.
In 2010, eight million tons of plastic trash ended up in the ocean from coastal countries—far more than the total that has been measured floating on the surface in the ocean’s “garbage patches.”
That’s the bad news. The even worse news is that the tonnage is on target to increase tenfold in the next decade unless the world finds a way to improve how garbage is collected and managed.
The findings are part of a groundbreaking study published Thursday in Science that for the first time quantifies how much garbage flows into the world’s oceans every year.
Until now, most efforts to measure ocean debris have involved sample counts of plastic floating on the surface in large garbage patches in each of the world’s oceans. A study last year, for example, estimated the amount of floating trash to be 245,000 tons at most.
The new study also identifies the major sources of plastic debris and names the top 20 countries generating the greatest amount of ocean-bound trash. China is first. The United States is 20th. The rest of the list includes 11 other Asian countries, Turkey, five African countries, and Brazil.
Even though the United States has a highly developed garbage collection system, it nevertheless made the top 20 for two reasons: It has a large, dense coastal population and, as a wealthy nation, is a large consumer of products.
“What we have done is look at the other side of the equation—what’s coming out of the faucet, rather than what’s already in the bathtub,” says Kara Lavender Law, an oceanographer at the Sea Education Association in Woods Hole, Massachusetts, and a co-author of the report.
“The size of the discrepancy is huge—20 to 2,000 times more than the range of estimates of floating debris. That is pretty shocking, especially when you consider that the amount going into the ocean in a single year and what we’re counting in the oceans has been going in for 50 years.”
To make the figure eight million tons comprehensible, Jenna Jambeck, the University of Georgia environmental engineer who led the study, likens it to lining up five grocery bags of trash on every foot of coastline around the globe.
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SOURCE: National Geographic, Laura Parker