The roofs of some houses on Laesoe, an island in Denmark, have been built from seaweed as an alternative to thatch and to promote sustainability in construction. "The idea was to re-introduce overlooked or disregarded organic materials to a modern industrialised technology at a time where low-carbon solutions are much called for," said Soren Nielsen, an architect who designed one of the houses. The use of seaweed could help improve thermal and acoustic insulation, and allow a building to withstand moisture.

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