Seaweed pouches will replace thousands of plastic bottles at the London marathon

More than 41,000 people will run the London Marathon on Sunday. When they reach mile 23, they'll be handed edible pods made of seaweed extracts instead of a plastic water bottle.
It's one way race organizers are hoping to reduce the huge amount of plastic waste generated during the endurance run. They want to cut the number of plastic bottles used by 200,000.