By Kelsey Campbell-Dollaghan

A highway overpass is the last place most of us would think to install a farm. But algae, that wonderful little…

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Source:: http://feeds.gawker.com/~r/gizmodo/full/~3/G9Vbw_nGk70/this-algae-farm-eats-pollution-from-the-highway-below-i-1653234583