Earthshot Prize-winner's solution for world's plastic problem? Seaweed

Dubbed the "Oscars of the Earth," the Earthshot Prizes recognize and reward innovative projects addressing climate change and other serious environmental problems. This year's Earthshot for "Build a Waste-Free World" was awarded to the London-based Notpla — a little wordplay of "not plastic" — whose mission is to replace single-use plastic with single-use seaweed.

Winning the Earthshot award for environmental innovation — and more than $1 million — was "completely surreal," said co-founder Pierre Paslier.

"We have to look at it as a war effort," he said, "because the scale of climate challenge is something that threatens the whole world all at once. It's in the air, it's in water, it's in our blood."