What do we look for when we buy a car? In fact, we are looking for our personal transportation, and a car that suits our driving needs. We may be looking for a family car, a hatchback, or a sedan. We may be looking for an SUV or a luxury car. However, regardless of the car that we want, we look for economy. Everyone today thinks about the environment, and the way to make the planet greener, and friendlier for the generations that will follow. We maybe driving a gas-guzzler, and when we see a truck spewing black smoke we instinctively curse it for polluting the environment.