More than 7,000 cities and towns across the globe — including many well-known spots — go dark for 60 minutes to get people thinking about climate change.
March 23, 2013 Before Earth Hour: The National Library is illuminated in Minsk, Belarus. At left is a monument of Belarusan enlightener Frantsysk Skorina. The lights were turned off during Earth Hour to highlight the global threat of climate change. Sergei Grits/AP Buy Photo