Eco-celeb Miranda Kerr was announced as the global ambassador for this year’s Earth Hour, which will start at 8:30pm on Saturday, March 26. Earth Hour, the global event created by the WWF, asks all homes and businesses to shut off all unnecessary electrics for one hour to help call attention to the issue of climate change.

According to the site, the event “originated in Sydney, Australia back in 2007, when 2.2 million individuals and more than 2,000 businesses turned their lights off to take a stand against climate change. Only a year later and Earth Hour had become a global sustainability movement with more than 50 million people across 35 countries participating.”

Not only will Kerr practice lights out during the hour, but she pledges to continue her earthly efforts by continuing to recycle and buying organic produce from local farmer’s markets to cut down on pesticide use.

In 2010, Earth Hour reportedly had at least 128 countries participating, which included 4,616 cities and 1,551 landmarks. This year, the country count is already above 130. That’s a lot of conserved energy!