The purples, golds, and greens of a variety of Gulf of Maine seaweed species shine through on a light table, including sugar kelp, sea lettuce, dulse, bladderwrack, and Irish moss. Seaweed is being heralded as a multifaceted solution to climate change, able to lock up carbon for hundreds of years, provide nutritious food for the world’s population, contribute biomass to new types of fuels, and reduce greenhouse gases by providing cows a burp-free, methane-less diet. But many scientists warn against rushing into the kind of massive seaweed production required without first answering critical outstanding questions.

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