Presented by ComEd, Earth Hour Illinois is March 26, 2011 at 8:30 p.m. Join the WWF, ComEd and people around the globe in turning out your lights for one hour to send a message about climate change.

Participating in Earth Hour 2011? Use the tag #earthhouril and #earthhour in your Flickr uploads, Tweets, Facebook posts and Foursquare check-ins.

Twitter: twitter.com/EarthHourIL

Facebook: facebook.com/EarthHourIL