Global pollution which is one of problems coming from socio-industry, forces people to protect environment in increasing ratio. In 70s and 80s, fuel type was selected mainly according to strategic safety and economic cost. In 90s, environmental factors were at the forefront. The main reason of development of this consciousness is cheaper cost of non-pollution than cleaning.
Alternative fuels to benzine are;

  1. Liquid Petroleum Gas (LPG)
  2. Compressed Natural Gas (CNG)
  3. Liquid Natural Gas (LNG)
  4. Methanol
  5. Ethanol
  6. Hydrogen

This document contains LPG and CNG which are most widely used among alternative fuels.