National Geographic Society. Photograph courtesy H. Tischlinger, Jura Museum Eichstätt . on solar power since it began operating in 2009 and had even recorded a cumulative surplus of 37 .2012 Traveler Photo Contest.
National Geographic Society . Photograph courtesy Mike Parker Pearson, University of Sheffield. Rachel Kaufman. for National Geographic News . operating in 2009 and had even recorded a cumulative surplus of 37 megawatt hours of electricity as at June 25 this year. 2012 Traveler Photo Contest.
