Pearl River in Guangzhou

This combination of pictures shows a tower illuminated (C) before Earth Hour and with its lights off (bottom) to mark the sixth global Earth Hour along the Pearl river in Guangzhou, in China's southern Guangdong province on March 31, 2012.

( STR/AFP / March 31, 2012 )

This combination of pictures shows a tower illuminated (C) before Earth Hour and with its lights off (bottom) to mark the sixth global Earth Hour along the Pearl river in Guangzhou, in China's southern Guangdong province on March 31, 2012.

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