Lights out: Cities worldwide mark the 10th annual Earth Hour

Cities around the world turned out the lights Saturday evening to mark the 10th annual Earth Hour, a global movement dedicated to protecting the planet and highlighting the effects of climate change.

As night came on, the lights went out in cities from South Korea to the United States in what the World Wildlife Fund describes as a moment of solidarity for climate action. The group sponsors the event and says people in 178 countries and territories had planned to participate.