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Sunlight streaming through a forest of giant kelp off Catalina Island in California. Credit: David Fleetham Getty Images
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A U.S. agency is funding projects to help create a bioenergy industry based on macroalgae. One day in the future, the Pacific Ocean could be home to kilometers of seaweed farms tended by submarine drones and waiting to be turned into fuel. This is the vision of Marine BioEnergy, a start-up backed by the Advanced Research Projects Agency–Energy (ARPA-E). The U.S. government agency is funding the company, along with a handful of related projects,...

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