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Welcome to Songdo, South Korea; green city of the future! Currently under construction, Songdo promises to be the greenest city in the world. [Such as|To start with,] this remarkable development contains 600 acres of wide open space. [In contrast|Consequently,] residents will always feel connected with nature [even though|like] they will be living in an urban environment. [All in all|Not only this, but] Songdo will be entirely powered by low emission fuels [such as|although] methane which causes little harm to the environment. [Firstly|However,] with apartments retailed at half a million pounds, green living does appear to come at a price.