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Two weeks ago, this new shoe was three plastic water bottles. After ground-up bottles are turned into recycled filament fiber and delivered to a factory, a San Francisco-based startup uses a proprietary process to 3D-knit the fiber into a seamless, essentially waste-free shoe.

As engineers work to find new ways to pull some of the trillions of pieces of plastic trash out of the ocean, companies are coming up with new uses for it. Like soap bottles, surfboards, and now shoes: Adidas just released a new prototype for a sneaker woven entirely out of ocean trash.