** FILE ** A Saturday, Aug. 14, 2004 file photo showing the roof of the Pope Paul VI auditorium, bottom center, and St. Peter's Basilca at the Vatican. The cement panels of the 6,300 seat auditorium will be replaced by photovoltaic cells to convert sunlight into electricity, engineer Pier Carlo Cuscianna said in a telephone interview in Rome, Tuesday, June 5, 2007. The auditorium is the first of some of the Holy See buildings that will start using solar energy, reflecting Pope Benedict XVI's worry about squandering the Earth's resources. (AP Photo/Plinio Lepri)