Who What Why - Humans have filled the world’s oceans with more than 170 trillion pieces of plastic, dramatically more than previously estimated, according to a major new study released Wednesday. The trillions of plastic particles — a ‘plastic smog,’ in the words of the researchers — weigh roughly 2.4 million metric tons and are doubling about every six years, according to the study conducted by a team of international researchers led by Marcus Eriksen of the 5 Gyres Institute, based in Santa Monica, Calif. That is more than 21,000 pieces of plastic for each of the Earth’s 8 billion residents. Most of the pieces are very small.
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