GB. England.The Scarlet, a new 36-room eco-hotel on England's North Cornwall coast, is notable not so much for its rich modernist details, infinity pools, giant glass walls with views of the beach below but for its thoughtful eco-minded design. Set on National Trust-protected land, the hotel has an indoor pool heated using solar panel energy and an outdoor swimming area filled with captured rainwater and filtered by reeds and other sieving plants that stand in for chlorine. Log fires warm the giant red teacup-shaped seaweed hot tubs overlooking the sea. The hotel also harvests its gray water, which is used for recycling the water that flows from showers and bathtubs and using it to flush the toilets. It's an adults-only hotel in a popular spot for holiday-making families. With a fantastic restaurant and an Ayurvedic spa. On this stretch of North Cornwall's stormy and beautiful coast, the Scarlet is possibly the greenest hotel in Britain.The owners are three sisters, Emma Stratton, Deborah Wakefield and Rebecca Whittington, their parents ran The Bedruthan Steps Hotel, a large family-friendly hotel higher up the same hill, still owned and run by the sisters. They decided to build a new hotel, as the kind of place they themselves would like to stay in. They came up with the unique concept of an eco-friendly, adult-only environment.