A combination of pictures shows the great Giza pyramids and the Sphinx before (top) and during Earth Hour in Cairo March 27, 2010. 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/Amr Abdallah Dalsh (EGYPT – Tags: CITYSCAPE ENVIRONMENT SOCIETY IMAGES OF THE DAY)