If you purchase an Energy Qualified Refrigerator you're going to use atleast 20% less electricity than your older model. If you choose a qualified model you'll end up cutting your electric bill by up to $165 during it's lifetime.
Do you currently have an older refrigerator in use? By replacing that older model which might have been made in the 80's you'll be saving up to $100 per year in energy savings. If you replace yet an older model from the 70's you could save up to $200 per year in energy use. It's these savings that will help you see the benefits of recycling that old refrigerator with a more efficient one.
By replacing your refrigerator you are not only saving energy, you are saving the environment from unnecessary green house gasses.