Candles are pictured during Earth Hour in the city centre of Frankfurt

Candles are pictured during Earth Hour in the city centre of Frankfurt March 23, 2013. 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 action to confront climate change. REUTERS/Lisi Niesner (GERMANY – Tags: ENVIRONMENT CITYSCAPE SOCIETY)