I like your idea of teaching about Earth Day through a play or skit. I found a play from the Illinois Environmental Protection Agency website that is a An Earth Day Story by Mary Beth Greene adapted from Charles Dickens' A Christmas Carol. I've never used this play, but I liked the idea.
Thinkfinity offers a collection of Earth Day Resources which may contain activities that you can use with your students. In addition, Thinkfinity has an archive of Think Green activities for students in grades K-12.
Members have contributed comments and suggestions in several discussions involving Earth Day and activities to encourage recycling and conservation. You may enjoy reading and contributing ideas to some of these discussions.
I hope others post their play and skit suggestions. Perhaps if you use Google to search for Earth Day plays and skits, you will find some possibilities. However, it's always helpful when someone has used the resource and can give a good recommendation.
Thanks for starting us thinking about celebrating Earth Day in April.
I am glad you liked the play and the Thinkfinity archive of Earth Day resources. Community members have bookmarked a number of favorite resources for Earth Day. You may like some of these and you can add them to your own favorite resources in the Verizon Thinkfinity Community (see How To: Add a Favorite Resource).