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Demand for seaweed is on the rise, as is the amount of seaweed being farmed off the coasts of countries like China, Korea, and Indonesia. Considering its myriad uses in items such as food, fertilizers, pharmaceuticals, and industrial gels, Scottish Association of Marine Science biologist Elizabeth Cottier-Cook says there’s a lot of good that could come from more seaweed cultivation. But a seaweed monoculture carries risks similar to those that have plagued other popular crops, she says. She describes the good and the bad of surging seaweed aquaculture.