Agence France-Presse: Around a billion people living in the world’s major cities are being invited to turn off their lights at 8:30 p.m. local time on Saturday for “Earth Hour,” described as the biggest mass campaign to demand action on climate change. The Empire State Building, the Great Pyramids of Giza, the Petronas Towers in Kuala Lumpur, the Acropolis in Athens and the Taipei 101 skyscraper in Taiwan are among the buildings whose illuminations will be switched off for an hour, the organisers said on …