POL100 - VARSOVIA (POLONIA), 31/3/2012.- Combo fotográfico que muestra tres fases de iluminación hasta apagarse totalmente del puente Swietokrzyski (i) y el Palacio de la Cultura y la Ciencia (d), durante la "Hora del Planeta" en Varsovia (Polonia). La hora del planeta se lleva a cabo alrededor del mundo a las 8.30 pm. hora local y es un llamado global a apagar las luces durante 60 minutos para hacer enfasis sobre el peligro del cambio climático. EFE/PAWEL SUPERNAK / PROHIBIDO SU USO EN POLONIA
This combo of pictures shows St. Peter's Basilica with the lights on (top) and with the lights off (bottom) in Rome during the sixth annual Earth Hour on March 31, 2012. Millions of people were expected to switch off their lights for Earth Hour on March 31 in a global effort to raise awareness about climate change that was even to be monitored from space. AFP PHOTO / FILIPPO MONTEFORTE
This combo of pictures shows Buenos Aires' Planetarium with the lights on (top) and with the lights off (bottom) during the sixth annual Earth Hour on March 31, 2012. Millions of people were expected to switch off their lights for Earth Hour on March 31 in a global effort to raise awareness about climate change that was even to be monitored from space. AFP PHOTO / Alejandro PAGNI