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"This year, Barcelona city council decided to set an example and opt for low energy Christmas lights around town. The most intriguing ones are the 6 metal Christmas trees that are either solar or bike-powered. The Barcelonans however believe they are"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/sustainable-product-design/oh-bike-powered-christmas-tree-how-are-thy-leaves-so-solar.html>