Earth Hour 2016

Cities worldwide turned off their lights for an hour Saturday night to mark this year's Earth Hour and highlight the pressing need for global climate action.

According to the Earth Hour movement's website, 2016's celebration—the tenth time the annual event has taken place—was the biggest ever, with an "unprecedented 178 countries and territories" taking part," and including "1.23 million individual climate actions, from petitions to on-the-ground activities.  Read more.