The Old Bridge is pictured during Earth Hour in Mostar March 29, 2014. Lights go off around the world at 8.30pm local time in a show of support for renewable energy during Earth Hour, an event organised since 2007 to promote a sustainable future for the planet. The 16th-century bridge was destroyed during the war in Bosnia between 1992-1995, rebuilt and opened again in 2004. REUTERS/Dado Ruvic (BOSNIA AND HERZEGOVINA - Tags: TRAVEL SOCIETY ENVIRONMENT)
The Gateway of India monument is pictured after Earth Hour in Mumbai March 29, 2014. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher action to confront climate change. REUTERS/Mansi Thapliyal (INDIA - Tags: ENERGY SOCIETY TRAVEL)
A combination picture shows the Sony Center at the Potsdamer Square before and during (bottom) Earth Hour in Berlin March 29, 2014. Lights go off around the world at 8.30pm local time in a show of support for renewable energy during Earth Hour, an event organised since 2007 to promote a sustainable future for the planet. REUTERS/Fabrizio Bensch (GERMANY - Tags: ENERGY ENVIRONMENT SOCIETY CITYSCAPE)