Combo picture shows the UNESCO World Heritage Cologne Cathedral and the Hohenzollern railway bridge along the river Rhine during and before Earth Hour

Combo picture shows the UNESCO World Heritage Cologne Cathedral and the Hohenzollern railway bridge along the river Rhine during and before Earth Hour

The UNESCO World Heritage Cologne Cathedral and the Hohenzollern railway bridge along the river Rhine, is seen during (top) and before Earth Hour, in this combination picture taken March 23, 2013. Earth Hour, when everyone around the world is asked to turn off the lights for an hour from 8.30 pm local time, is meant as a show of support for tougher actions to combat climate change. REUTERS/Wolfgang Rattay (GERMANY – Tags: ENVIRONMENT TRAVEL SOCIETY ENERGY)