Earth Hour took place earlier this evening. Here are new additions to The Best Sites To Learn About “Earth Hour”:

AP Photos: Cities go dark for ‘Earth Hour’

Worldwide blackout: Landmark buildings across the globe switch off their lights to celebrate Earth Hour
is from The Mail Online.

In pictures: Earth Hour around the world is from The BBC.

Cities across the globe celebrate Earth Hour is a photo gallery from CNN.

Earth Hour 2013: Does it really save energy? is from The Christian Science Monitor.