As the number of vehicles produced around the world increase every year, so does the pollution from these vehicles. The number of automobiles on the roads around the world have increased around ten-fold in the past 50 years. Analysts predict that the number will double in the next 25 years. Now, many countries are experimenting with alternatives to gasoline and diesel fuel in an attempt to reduce harmful emissions. These alternatives are liquefied petroleum gas extracted from natural gas; compressed natural gas derived from gas wells or in conjunction with crude oil production; Ethanol, derived from biomass and Methanol which is derived from natural gas, biomass or coal.
Number of vehicles using various types of fuels
|*CNG: compressed natural gas; LPG: liquefied petroleum gas|
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