World marks green day; big city mayors sign pacts 1 hour, 29 minutes ago World Wildlife Fund (WWF) members put up a giant faucet in front of the 'Christ the Redeemer' statue, atop Corcovado mountain, in front of one of Rio de Janeiro's best-known tourist attractions, Sugar Loaf mountain, during celebrations of World Environment Day in Rio de Janeiro, June 5, 2005. (Reuters/Bruno Domingos) SAN FRANCISCO (Reuters) - Big city mayors from around the world signed a series of pacts on Sunday to improve the conditions of urban centers, capping a five-day U.N. World Environment conference in San Francisco, the...