Well, you better make sure it’s running efficiently.  Okay, I know that’s not the joke, but according to National Geographic, doing two simple things to your refrigerator can save 700 pounds of carbon dioxide per year. 

1. Keep your refrigerator coils clean.  If you need a walk through on where they are and how to clean them, click here.
2. Maintain a tight seal on the door.  To test the seal, close a dollar bill or piece of paper in the door.  If you can pull it out easily, you need a new seal.