The efforts of WICKED to go environmentally green will be shown in "The Green Apple: Entertainment," which will air on NYC Life (Channel 25 in NY) on April 22 at 9 PM. A sneek peak of the special was shown on broadwayworld.com. Dee and Erin appeared in the video and the said the show was coming up on six years on Broadway so I think this was filmed before Wicked's six-year anniversery.
http://www.broadwayworld.com/videoplay.php?colid=123269