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My team and I make bioplastics from simple renewable ingredients: saltwater microbes, seaweed and seawater. The seaweed provides a carbon source for fermentation, similar to how beer is made by fermenting hops. The saltwater microbes naturally produce polymers called polyhydroxyalkanoates (PHAs) that could replace many, maybe even all, synthetic plastics. And these PHAs are biodegradable, even in cold, dark conditions such as the deep ocean. Unlike other bioplastics, this material will also compost on its own in household waste.