Also, seaweed is at the bottom of the food chain -> lots of biomass supported by the ecosystem, less chance of accumulating anything toxic.

“Europe produces 0,2% of algae in the world,” he said. "But we import 500 million worth of algae every year.

Yup. I like seaweed, but most of the seaweed I like comes from Asia. Transporting it from far is not a smart move.