This Wednesday, Nov. 26, 2008, file photo, shows solar panels on the roof of the Paul VI Hall, at the Vatican. Pope Benedict XVI was dubbed "the Green Pope" for his frequent calls to stop ecological devastation and his efforts to bring solar power to the Vatican city-state. "Can we remain indifferent before the problems associated with such realities as climate change?"’ Benedict said in 2010. (AP Photo/Alessandra Tarantino)