Seaweed biofuels: a green alternative that might just save the planet

"It's best to get it out of the water now or it'll start getting grazed by the little beasties," says Lars Brunner as he hauls 50kg of glistening, translucent kelp from the dark waters of the Sound of Kerrera into the boat. The long summer days mean the seaweed is rapidly storing up sugars, which snails and barnacles find delicious.