Biofuels can be made from sources grown specifically for that purpose (e.g. switchgrass, algae). They can also be produced from the "waste" products of other processes. Identify a potential source of this second type of biofuels in your area. This could be anything from used cooking oil...
For the source you have identified, post estimates of the following to the discussion forum (The key word is "estimates", don't spend more than 2 hours on this):
How much supply is available? For example, how much oil do restaurants in your town go through? How many pounds of waste peaches are there?
How much energy could be produced by this supply? There are many calculators available online. You can probably find one specific to your source, but here are some examples: Biofuels B2B, Biomass to energy calculator.
What are the downsides to using this source of energy?