Tony Haymet, former director of the Scripps Institution of Oceanography, has heard hundreds of ocean cleanup plans. Late at night, over many beers, he’s come up with a few dozen of his own. None of them, he says, has seemed likely to work.

That includes this spring’s offerings. A Dutch engineering student, Boyan Slat, envisions a contraption with massive booms that would sweep debris into a huge funnel. Songwriter and music producer Pharrell Williams wants to fund the monumental cost of any cleanup by turning recycled ocean plastic into yarn and then clothes.

The challenge is huge. For one thing, the garbage is spread over millions of square miles. For another, it’s made up mostly of degraded plastic, broken down by sunlight and waves into tiny bits the size of grains of rice.

Read full article.