The fourth in the series of family specials on the environment. Focusing on energy use and sustainability, the show features stories about endangered animals alongside scenes with kids who are working to protect the nature around them - from the mountaintops to the coral reefs. Readings and performances by Elizabeth Mitchell, Willie Nelson, They Might be Giants, Dan Zanes, and behind-the-scenes at the American Museum of Natural History with Dr. Christopher Filardi and Dr. Mande Holfold.