Seaweed and algae are being used to create bioplastics to traditional plastics that pollute the environment and take centuries to decompose. Oceans and landfills are filled with plastics. Seaweed and algae-based plastics can be composted, and they decompose in a short time. Some plant-based plastic alternatives are very durable, versatile and can even be edible. There are plant-based alternatives to everything, water plants like seaweed, kelp, and algae can easily replace many types of plastics.