Ethanol from corn is debated, as alternatives are also presented. ...
... "The municipal and industrial waste generated in the United States could provide up to 50 billion gallons per year of clean transportation fuels through the use of plasma gasification. " ...
Via New York Times: Energy Question
Recovered Energy, Inc on Plasma Gasification
: "Plasma gasification is the gasification of matter in an oxygen-starved environment to decompose waste material into its basic molecular structure. Plasma gasification does not combust the waste as incinerators do. It converts the organic waste into a fuel gas that still contains all the chemical and heat energy from the waste."
Plasma arc waste disposal via Wikipedia
: "This arc breaks down waste primarily into elemental gas and solid waste (slag), in a device called a plasma converter. "