Biofuels, what are they?

What are the four categories of biofuels? Dennis Pennington, Sr. Bioenergy Educator, Michigan Sate University Extension, explains the differences between biofuel types.

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6. The amount of energy used by human society depends on many factors.
8. Wood based bio-fuels are one form of energy that is renewable

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8.6 Liquid fuel can be produced from wood feedstocks.

6.4 Earth has limited energy resources.

8.1 Sources of cellulosic residuals used are found in forest operations and in industry process