A combination of pictures shows the medieval Charles Bridge in Prague before and during Earth Hour

A combination of pictures shows the medieval Charles Bridge in Prague before and during Earth Hour

A combination of pictures shows the medieval Charles Bridge in Prague before (top) and during Earth Hour 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 tougher action to confront climate change. REUTERS/Petr Josek (CZECH REPUBLIC – Tags: SOCIETY CITYSCAPE ANNIVERSARY ENERGY ENVIRONMENT TPX IMAGES OF THE DAY)