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3It wasn’t the first time that nations at war turned to seaweed. During the First World War, the U.S. relied on the giant kelp seaweed (Macrocystis) to boost production of potash (a fertilizer produced in Germany), gunpowder, and acetone.

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The same picture is seen across the transport network - currently a third of railways are at risk of flooding, which leads to cancellations and damaged infrastructure.

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