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"When it comes to transportation, TreeHugger thinks human power is the way to go, but there are times when two wheels just won't cut it. Have a look at some of the best human-powered bicycle alternatives from our past."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/culture/treehugger-picks-human-powered-bicycle-alternatives.html>