Russia Earth Hour

This combination picture of Moscow State University taken before and after the lights were turned off during the worldwide Earth Hour, a global campaign to highlight the threat of climate change in Moscow, Saturday, March 31, 2012. Millions of people worldwide were switching off lights and appliances for an hour from 8.20 p.m. in a gesture to highlight environmental concerns and to call for a binding pact to cut greenhouse gas emissions. (AP Photo/Sergey Ponomarev)

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