Leifeng Pagoda is seen behind the West Lake before Earth Hour in Hangzhou

Leifeng Pagoda is seen behind the West Lake before Earth Hour in Hangzhou, Zhejiang province, March 28, 2015. 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/Chance Chan