A combination photo shows a Soviet era skyscraper on Kotelnicheskaya Embankment near the Moskva River before (top), and during Earth Hour in Moscow March 31, 2012. 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/Maxim Shemetov (RUSSIA - Tags: SOCIETY ENVIRONMENT CITYSPACE ENERGY ANNIVERSARY)
A combination picture shows the India Gate before (top) and during Earth Hour in New Delhi March 31, 2012. 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/Parivartan Sharma (INDIA - Tags: ENVIRONMENT ENERGY SOCIETY TRAVEL CITYSPACE ANNIVERSARY)
The 97-metre monument Baiterek is seen before Earth Hour in Kazakhstan's capital Astana, March 31, 2012. 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/Mukhtar Kholdorbekov (KAZAKHSTAN - Tags: SOCIETY ENVIRONMENT TRAVEL ENERGY CITYSPACE)