image creditCities aren't exactly known for lush scenery - they don't call it a concrete jungle for nothing. But as horticultural technology improves and global warming becomes a bigger concern, a new trend has emerged: urban green spaces.
Not only are urban gardens good for Mother Earth - by helping reduce water pollution and improve air quality - they're also beautiful works of art. Whether you're a city-dweller or suburbanite, celebrate the 40th anniversary of Earth Day with these inspiring metropolitan oases.
(thanks Jessie)
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