📘 IAS Prelims 2025 — GS-III Q.63 | Classroom Explanation

(Ethanol Production | Feedstock Geography | Energy–Environment Interface)

📌 Question Recap

Statement I:
Of the two major ethanol producers in the world, Brazil and the United States of America, the former produces more ethanol than the latter.

Statement II:
Unlike in the United States of America where corn is the principal feedstock for ethanol production, sugarcane is the principal feedstock for ethanol production in Brazil.

✅ Correct Answer: (d)

Statement I is not correct but Statement II is correct

🧑‍🏫 Core Explanation (Step-by-Step)

🔹 Statement I ❌ Incorrect

• The United States is the world’s largest ethanol producer, not Brazil.
• Recent global production data shows:
  • USA: ~16 billion gallons/year
  • Brazil: ~8–9 billion gallons/year
• Together, USA + Brazil ≈ 80% of global ethanol output, but the USA clearly leads.

👉 Hence, Statement I is factually incorrect.

🔹 Statement II ✅ Correct

• USA: Ethanol is produced mainly from corn (maize)
• Brazil: Ethanol is produced mainly from sugarcane

👉 This distinction is fundamental, well-established, and frequently tested by UPSC.

🌱 High-Value Enrichment Points (Very Important for Prelims)

🔸 1. Energy Efficiency Difference (Why Sugarcane Matters)

• Sugarcane ethanol (Brazil):
  • Much higher energy return on energy invested (EROI)
  • Lower lifecycle greenhouse gas emissions
• Corn ethanol (USA):
  • Energy-intensive cultivation
  • Higher fertilizer, water, and fossil-fuel input

👉 This explains why Brazilian ethanol is considered more climate-efficient, even though total volume is lower.

🔸 2. Environmental Footprint Comparison

🔸 3. Co-product Advantage in Brazil (Exam Favourite)

• Bagasse (fibrous residue of sugarcane):
  • Used to generate bio-electricity
  • Makes sugar mills energy self-sufficient
• USA corn ethanol does not have such strong energy co-generation advantage.

🔸 4. India Connection (Prelims Relevance)

• India’s Ethanol Blended Petrol (EBP) Programme:
  • Initially grain-based (maize, rice)
  • Gradually shifting towards sugarcane-based ethanol
• Brazil is often cited as a model for India’s ethanol economy.

🔸 5. UPSC Trap Alert 🚨

• UPSC often tests:
  • “Who produces more?” vs “Who is more efficient?”
• Brazil is more efficient per unit,
  but USA produces more in absolute terms.

🎯 Final Answer Recap

• ❌ Statement I — Incorrect
• ✅ Statement II — Correct

✅ Correct Answer: (d)

Statement I is not correct but Statement II is correct