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explain why
'''Alcohol''' is a class of [[liquid]] [[chemical]]s that have certain combinations of [[hydrogen]], [[carbon]] and [[oxygen]], i.e., [[hydrocarbon]]s, and that can be used as [[fuel]]s.<ref>http://www.energy.ca.gov/glossary/glossary-a.html#a</ref>
'''Alcohol''' is a class of [[liquid]] [[chemical]]s that have certain combinations of [[hydrogen]], [[carbon]] and [[oxygen]], i.e., [[hydrocarbon]]s, and that can be used as [[fuel]]s.<ref>http://www.energy.ca.gov/glossary/glossary-a.html#a</ref> They are generally thought to be a cleaner and more sustainable fuel, although they are also more expensive and cut into the food supply.
==References==
==References==