A combination photo shows the old opera and the opera tower during Earth Hour, and after Earth Hour in Frankfurt

A combination photo shows the old opera and the opera tower during Earth Hour, and after Earth Hour in Frankfurt

A combination photo shows the old opera and the opera tower during (top) Earth Hour, and after Earth Hour in 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)