Physics- Biofuels/ how they work/ pros and cons.

What is a biofuel?

A fuel derived from recently living organisms such as plants, algae, or animal waste.

How do biofuels differ from fossil fuels?

Biofuels come from recent biomass, while fossil fuels originate from organisms that lived millions of years ago and were transformed by geological processes.

Name three common plant feedstocks for biofuels.

Corn, sugarcane, soybeans (also rapeseed).

What is the “carbon‑neutral” claim for biofuels?

The CO₂ emitted when biofuels burn was previously absorbed by the feedstock during growth.

Name two factors that can reduce the net carbon benefit of biofuels.

Land‑use change and fossil‑energy used in cultivation, processing, and transport.

What are three advantages of biofuels for everyday transport?

Renewable, relatively cheap at scale, and compatible with existing petroleum engines (can be blended).

Identify two environmental trade‑offs associated with biofuel production.

• Conversion of natural land (e.g., forests) to agriculture and competition with food crops.

Why is animal waste considered a limited source of biofuel?

The quantity of animal waste available is relatively small compared with plant‑based feedstocks.

What overall strategy does the note suggest for using biofuels?

Incorporate them as part of a mixed‑energy approach alongside other renewables (solar, wind) when they make environmental and economic sense.