Children dressed as spiderman throw "spider thread" for the count down of the Earth Hour environmental campaign event in suburban Tokyo on March 29, 2014. Lights will go out in some 7,000 cities and towns from New York to New Zealand for Earth Hour which this year aims to raise hundreds of thousands of dollars for green projects. AFP PHOTO / Yoshikazu TSUNO
A combination photo shows people walking past the skyscrapers Shanghai World Financial Center, Shanghai Tower and Jin Mao Tower (L-R) before (top) and during Earth Hour at the financial district of Pudong in Shanghai March 29, 2014. 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/Carlos Barria (CHINA - Tags: SOCIETY ENVIRONMENT)
This combination picture of two photographs show the Wat Arun Ratchawararam Ratchawaramahawihan Buddhist temple before (top) and after (bottom) its lights were turned off to mark Earth Hour in Bangkok on March 29, 2014. Lights will go off in some 7,000 cities around the world for this weekend's Earth Hour event, which will aim to raise hundreds of thousands of dollars for environmental projects worldwide. AFP PHOTO/PORNCHAI KITTIWONGSAKUL