A combination photo shows the Bosphorus Bridge that links the city's European and Asian sides, with the European side in the background, is seen before (top) and during Earth Hour in Istanbul March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 pm local time, is meant as a show of support for tougher action to confront climate change. [Photo/Agencies]