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POPSSolution to global warming: Floating cities The 'Lilypad City' would float around the world as an independent and fully self-sustainable home. With a lake at its centre to collect and purify rainwater, it would be accessed by three separate marinas and feature artificial mountains to offer the inhabitants a change of scenery from the seascape. Power for the central accommodation hub is provided through a series of renewable energy sources including solar panels on the mountain sides, wind turbines and a power station to harness the energy of the waves.