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Solar power: Harnessing the sun's energy

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Johannes Dahl, of German company Thermovolt, fixes a solar panel on the roof of the Paul VI Hall, at the Vatican, on Sept. 29, 2008. A total of 2,400 panels were installed in order to provide 300,000 kilowatt hours of energy which will be used to illuminate, heat, and cool the building where the pontiff holds his general audiences in the winter and in bad weather. Concerts in honor of the pontiff are also staged in the 6,300-seat hall. In the background St. Peter's Basilica can be seen.

PHOTO: Riccardo De Luca/AP/FILE

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