Earth Hour is an annual event when people around the globe switch off non-essential lights for one hour as part of the largest voluntary environmental action.

The public is invited to join community leaders on Saturday, March 31, 2012, from 3 p.m. to 7:15 p.m. at the Tucson Convention Center (TCC) for a light dinner and discussion about preparing for climate change. Then, at 7:30 p.m. the group will move to El Presidio Park for a celebration as the lights on City Hall are turned off. Tucson's Earth Hour event is free and open to the public and will include brief remarks from city officials and area environmental leaders. The event, at 160 W. Alameda Street, will also include a variety of entertainment and food vendors.

For more information about the Earth Hour City Challenge or to arrange an interview with a WWF representative, contact Matt Farrauto at (202) 495-4593 or