Diesel and petrol cars dominate new car sales, but gas (e.g. LPG), biofuel and hybrid vehicles are also available. Diesels emit slightly less CO2 in their exhaust than petrol vehicles, but more local pollutants which are harmful to health. Hybrids give maximum benefit if your journeys involve lots of urban driving. You can check the carbon dioxide emissions and fuel consumption of new cars in the VCA guide. Advertisements for new cars give the CO2 emissions and this information is available at the showroom.
Vehicles that run on alternative fuels include LPG (liquid petroleum gas), electric or hybrid vehicles. Cleaner fuels are becoming more widely available and they may save you money and reduce pollution.