Clean-up craft designed by a young man have already stopped 50m kilos reaching the sea. He says $1bn could end the scourge altogether His confidence relies on research that suggests that stopping pollution in just 30 cities around the world will cut a third of the plastic waste that enters the oceans. Slat plans to tackle these first 30 cities by 2030 at a cost of $350 million (£26... [4265 chars]
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