Not everyone can run out and trade in their old gas-guzzling clunker for the latest planet-friendly hybrid car. And that’s not necessarily a bad thing; manufacturing new cars takes a lot of resources too. But if you’re in the market for a new car, look for a fuel-efficient model — you’ll save thousands on gas money and reduce your carbon footprint over the years. If you’re buying a new refrigerator, washer or dryer, look for the Energy Star label to find the most efficient appliances. Need a new water heater? Consider upgrading to solar.