It’s the 6th year for Earth Hour which encourages people to turn off their lights for 60 minutes one day a year. The celebration takes place every year on March 31 between 8:30 and 9:30 p.m. This year, the campaign is hoping its impact will last more than one hour.

The “I Will If You Will” campaign is hosted by YouTube and was spearheaded by the Earth Hour founders, the World Wildlife Foundation and Leo Burnett. Supermodel Miranda Kerr is also on board.

So will you you too?