The document discusses ethanol as an alternative fuel. It notes that the US is heavily dependent on fossil fuels and ethanol can help reduce greenhouse gas emissions. Ethanol is made from plants like corn and wheat. It has advantages like being cleaner burning and potentially cheaper than gasoline. However, it also has disadvantages like requiring more energy to produce and lack of infrastructure for E85 fueling stations. The document also warns that using ethanol in unmodified vehicles can cause damage.