www.alternativefuelstips.com Common alternative fuels include bio diesel, butanol, ethanol, chemically stored electricity (batteries and fuel cells), methane, natural gas, wood, hydrogen, vegetable oil, biomass, and peanut oil. The term “alternative fuels” usually refers to a source of which energy is renewable. When we say renewable energy it is the energy from renewable sources like wind power, geothermal power, solar power, tidal power, hydro power or thermal depolymerization. There is growing social interest, and an economic and political need for the expansion of alternative fuel sources. This is due to general concerns of sustainability, environmental, economic, and geopolitical reasons. There are two major concerns that are that of rising cost of fuels derived from fossils caused by an era of growing energy usage and of the crisis of global warming. http