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Cigarette butts are the worst contaminant of oceans
#1
https://www.nbcnews.com/news/us-news/pla...an-n903661

A new study suggests that «the No. 1 man-made contaminant in the world’s oceans is the small but ubiquitous cigarette butt».

There's lots of these things. «The vast majority of the 5.6 trillion cigarettes manufactured worldwide each year come with filters made of cellulose acetate, a form of plastic that can take a decade or more to decompose. As many as two-thirds of those filters are dumped irresponsibly each year». Of all the collected trash on beaches, cigarette butts make up a third of it. They're the most littered item in the world. And studies show that the "filters" don't make it any safer to smoke at all.

I suspect the article is being somewhat clever when it says that it's the number one contaminant though—they're probably using a misleading metric, maybe volume?—because fishing nets and similar fishing items are probably the number one, is my guess.
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