Answer: Good question! I have a "gladness" feeling in my heart because you asked. To put it simply, we need to save or conserve energy because most of the energy sources we depend on, like coal and natural gas, can't be replaced. Once we use them up, they're gone forever. For more information about the need to save energy visit the Alliant Energy Kids Web site. Other good information can be found at the U.S. Department of Energy Web site section Ask a Scientist, and the California Energy Commission Web site for Professor Questor. At the bottom of Professor Questo'rs Saving Energy page is a list of links to even more information. I hope you have fun learning about the need to save energy.