Corn and other crops can provide ethanol and other biofuels that currently costs more than gasoline and other fossils fuels, but is a renewable energy source with few emissions. Corn and other crops can provide ethanol and other biofuels that currently costs more than gasoline and other fossils fuels, but is a renewable energy source with few emissions. 

Corn and other crops can provide ethanol and other biofuels that currently costs more than gasoline and other fossils fuels, but is a renewable energy source with few emissions.

First, compare and contrast biofuels and fossils fuels. For example, how is corn converted into ethanol?  What is the original source of energy in fossil fuels? Then discuss whether or not you think biofuels are viable alternative to fossil fuels as a renewable energy source.