People participates the celebrations of Earth Hour organized by WWF Brazil, at the museum of the republic in Brasilia

People gather with candles during an event of Earth Hour, organized by WWF Brazil, at the Museum of the Republic in Brasilia March 23, 2013. Earth Hour, when everyone around the world is asked to turn off the lights for an hour from 8.30 pm local time, is meant as a show of support for tougher actions to combat climate change. REUTERS/Ueslei Marcelino (BRAZIL – Tags: SOCIETY ENERGY ENVIRONMENT)