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Sure, the Emerald City looked green, but you won't need green-tinted glasses to see how environmentally friendly the cities on this list are. What makes a city amazingly green?
As two of the most important elements to the sustenance of life on Earth, the sun and water are forever intertwined. Just to name one example, the sun's energy can be used to make water palatable to those who wouldn't be able to drink it otherwise.