epa04684270 A combo photograph showing (top) Saint Peter’s Basilica is seen lit before lights were turned off and (bottom) Saint Peter’s Basilica stands in darkness after lights were turned out for one hour to mark Earth Hour, Vatican City, 28 March 2015. 170 countries and 1200 monuments’ lights are to be switched off at exactly 8.30pm local hours, taking part in the operation Earth Hour for its 2015 edition. Launched by the World Wide Foundation, the event is meant to highlight the importance to fight global warming. EPA/CLAUDIO PERI
