Scientists have worried about plastic debris in the oceans for decades, but focused on enormous accumulations. More recently, the question of smaller bits has gained attention. View post: Scientists Turn Their Gaze Toward Tiny Threats to Great Lakes ; ;Related ArticlesTiny Bits of Plastic Pose Big Environmental ThreatsCity Room: A Night Swim for Atlantic HerringCalifornia Plans Tighter Control of Fracking, but Not Enough for Some ;

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Scientists Turn Their Gaze Toward Tiny Threats to Great Lakes