Final answer:
Biofuels offer a potential alternative to traditional fossil fuels for energy, but there are challenges that impact their future potential.
Step-by-step explanation:
Biofuels offer a potential alternative to traditional fossil fuels for energy. They are derived from crops or algae and can be used as a liquid fuel substitute for transportation. While biofuels have the advantage of being a renewable energy source and reducing greenhouse gas emissions, there are challenges to their widespread use. The scalability, competition with food production and arable land, low energy return on energy invested (EROEI), and potential environmental concerns are all factors that impact the future potential of biofuels as an energy source.