If your any part of your science or social studies curriculum deals with alternative fuel sources, Explania has a short video that may be of interest to you. What is CNG? is a short explanation of compressed natural gas, where it comes from, and the benefits of using it compared to gasoline or diesel.
What is CNG? – Explania
The video was sponsored by a compressed natural gas company so you will want to have a discussion about bias with your students if you do choose to show the video.