Twenty-five-year-old university dropout Boyan Slat [[BOY-yuhn]] founded The Ocean Cleanup to create a system that catches plastic waste floating in the ocean.
His new machine is a floating solar-powered device called the "Interceptor".
It looks a bit like a covered barge scooping plastic out of rivers as it drifts downstream.
Boyan Slat's organisation has been criticised for focusing only on plastic waste already polluting the world's oceans.
Experts say eight million tonnes of plastic waste, including plastic bottles, bags, toys and other items, flows annually into the ocean from beaches, rivers and creeks, endangering marine life.
