The problem with saving energy is we waste energy. We waste energy in a lot of different ways. If we don't waste energy then we have more energy to use for different things. One reason is if we leave the lights on in a room it wastes energy and then you can't use the lights in that room. Another reason is that the older refrigerators you have then the more energy it wastes. The last reason is the windows.
Possible Solutions For Saving Energy
Use energy efficient windows and use new refrigerators and also use efficient lighting.