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Sea levels are rising , and some major cities - like New York and London - are in danger . There aren't any easy answers to this problem , but scientists are looking at some possibilties . For example , the strange thinks in the photo are called Lilypad Cities and they float on the surface of the ocean . They're a kind of eco-city . They only use clean energy , so they don't create any pollution . And there aren't any cars - in fact , there aren't any roads . But there are some footpaths . When the residents want some exercise , they go for a walk in the artificial mountains . There are certainly some big advantages to living in a
Lilypad City . But sadly , there aren't any plans to build one yet .

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