• Biofuel - Wikipedia

    A biofuel is a fuel that is produced through contemporary biological processes, such as agriculture and anaerobic digestion, rather than a fuel produced by geological processes such as those involved in the formation of fossil fuels, such as coal and petroleum, from prehistoric biological matter.If the source biomatter can regrow quickly, the resulting fuel is said to be a form of renewable ...

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  • Alternative energy - Wikipedia

    Alternative energy is any energy source that is an alternative to fossil fuel.These alternatives are intended to address concerns about fossil fuels, such as its high carbon dioxide emissions, an important factor in global warming. Marine energy, hydroelectric, wind, geothermal and solar power are all alternative sources of energy.. The nature of what constitutes an alternative energy source ...

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