Biofuel is defined as solid, liquid or gaseous fuel obtained from relatively recently lifeless or living biological material and is different from fossil fuels, which are derived from long dead biological material. Components and Process
Biomass, a renewable energy source, is biological material derived from living, or recently living organisms, such as wood, waste, and alcohol fuels. Ethanol
Environmental Impact
Biomass into Biofuel
Solar energy is the radiant light and heat from the Sun that has been harnessed by humans since ancient times using a range of ever-evolving technologies. Light into Energy
Wind power is the conversion of wind energy into a useful form of energy, such as electricity, using wind turbines. Understanding Wind
Efficient energy use, sometimes simply called energy efficiency, is using less energy to provide the same level of energy service. Economical Efficieny
Public transport comprises passenger transportation services which are available for use by the general public, as opposed to modes for private use such as automobiles or vehicles for hire. Environmental Impact
A plug-in hybrid electric vehicle (PHEV) is a hybrid vehicle with batteries that can be recharged by connecting a plug to an electric power source. Fuel Cells

All descriptions were provided from http://wikipedia.org.

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