Affects rubber and some plastics and metals. Corrosion and wear in engine increase sharply in cold climates. Burns with invisible flame and is explosive and toxic. Fuel-efficient as diesel oils. Disadvantages Only produced in small quantities.
Emissions contain toxic substances.
Disadvantages Large amounts of insecticide used in production. Total energy consumption twice that of gas. Advantages Technology of process of being introduced. Gas has to be compressed and purified from carbon dioxide. If the biogas leaked from landfills could be used as a vehicle fuel, the addition of greenhouse gases from leakage and the emission of carbon dioxide would be reduced.