Over 1 million NGVs are in use around the world. Natural gas as a vehicle fuel is versatile. It is suitable for use in both heavy vehicles which currently use diesel, and lighter vehicles which use petrol. In 1999 there were 1902 NGVs in Australia including taxis, buses, trucks, forklifts, cars, vans, utilities and a cargo ship. Fuel Oil 73.6 Automotive diesel fuel 69.7 LPG 59.4 Natural gas 50.9 Natural gas emits less carbon dioxide per unit of energy than any other fossil fuel and is widely seen as a greenhouse solution, eg.
Gas is also a clean burning fuel.
The greenhouse effect is a natural phenomenon. Sunlight warms the earth's surface and radiant heat is then emitted back to the atmosphere. A portion of this heat is absorbed by greenhouse gases and re-emitted back to earth, creating further warming. Human activities, including combustion of fossil fuels which produces carbon dioxide, are adding to global greenhouse gas emissions. A very good reason to use natural gas.