UPSC Prelims 2025Question 63International Relations

Consider the following statements:
Statement I: Of the two major ethanol producers in the world, i.e., 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.
Which one of the following is correct in respect of the above statements?

Options

(a)Both Statement I and Statement II are correct and Statement II explains Statement I
(b)Both Statement I and Statement II are correct but Statement II does not explain Statement I
(c)Statement I is correct but Statement II is not correct
(d)Statement I is not correct but Statement II is correct

Correct answer: d

Decision rule

Efficiency and volume are separate claims: the more energy-efficient producer is not automatically the larger one; verify the ranking before accepting an explanation.

Explanation

Correct Answer:

(d) Statement I is not correct but Statement II is correct

Explanation of the Correct Answer

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

Incorrect
The United States of America is the largest ethanol producer in the world, not Brazil.
As per data from the U.S. Energy Information Administration (EIA) and Renewable Fuels Association (RFA):
- USA contributes nearly 50–55% of global ethanol production.
- Brazil contributes around 25–30%.

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
The USA uses corn (a starch-based crop), while Brazil uses sugarcane (a sucrose-based crop) as the main raw material for ethanol.
Sugarcane-based ethanol in Brazil is more energy-efficient and has lower greenhouse gas emissions compared to corn-based ethanol.

Why Other Options Are Incorrect

(a) Both Statement I and Statement II are correct and Statement II explains Statement I – Incorrect: Statement I is not correct.
(b) Both Statement I and Statement II are correct but Statement II does not explain Statement I – Incorrect: Statement I is incorrect.
(c) Statement I is correct but Statement II is not correct – Incorrect: Reverses the actual facts.
(d) Statement I is not correct but Statement II is correct – Correct, based on actual production data and feedstock usage.

Relevant Supplementary Information

Table: Comparison of Ethanol Production – USA vs. Brazil

Feature	United States	Brazil
Feedstock	Corn (Zea mays)	Sugarcane
Production Share (Global)	~50–55%	~25–30%
Main Usage	Fuel blending in gasoline (E10, E15, E85)	Flex-fuel vehicles (E25, E100)
Energy Efficiency	Lower (net energy gain ~1.3:1)	Higher (net energy gain ~8:1)
GHG Emissions	Higher due to fossil-based cultivation	Lower due to renewable bagasse-based energy
Major Agencies	U.S. DOE, RFA, EIA	UNICA (Brazilian Sugarcane Industry Association)

Related Concepts

First-generation biofuels: Ethanol produced from food crops like corn and sugarcane.
Energy Return on Investment (EROI): A metric for assessing the energy efficiency of biofuel sources.
Flex-fuel vehicles: Common in Brazil, can run on varying blends of ethanol and gasoline.

Current Relevance

India's Ethanol Blending Program (EBP) is learning from Brazil’s sugarcane ethanol model.
As part of net-zero carbon goals, many countries are adopting biofuels as a transitional energy source.
Ethanol's role is central in debates on food vs. fuel, energy security, and carbon neutrality.

Table: Concepts and Comparative Insights – Ethanol Production (USA vs. Brazil)

Concept / Term	Description	United States	Brazil	Relevance
Ethanol	A renewable biofuel made by fermenting plant-derived sugars	Produced mainly from corn	Produced mainly from sugarcane	Used as a substitute or additive to gasoline
Feedstock	Raw material used for ethanol production	Corn (Zea mays) – starch-based	Sugarcane – sucrose-based	Determines efficiency, emissions, and cost
First-Generation Biofuel	Ethanol made from food crops	Yes	Yes	Raises "food vs. fuel" concerns
Energy Efficiency (EROI)	Energy Return on Investment – ratio of energy output to input	~1.3:1	~8:1	Sugarcane ethanol is more energy efficient
Greenhouse Gas Emissions	Total GHG released in the lifecycle of ethanol production	Higher (due to fossil-fuel usage in corn farming)	Lower (bagasse powers sugar mills)	Important for climate policies
Flex-Fuel Vehicles	Vehicles that can run on variable ethanol-gasoline blends	Less common	Very common (E25–E100)	Boosts domestic ethanol consumption
Ethanol Blends	Ratio of ethanol to petrol in fuel	E10, E15, E85 common in USA	E25, E100 common in Brazil	Mandated through government blending targets
Major Ethanol Agencies	Key regulators and industry associations	RFA, EIA, U.S. DOE	UNICA (Brazil), ANP	Promote, regulate, and track ethanol production and policy
Production Rank (Global)	Share in global ethanol output	#1 (~50–55%)	#2 (~25–30%)	Helps assess global energy market shares
India’s Ethanol Model	Blending target (E20 by 2025)	Learning from USA & Brazil	Learning from Brazil’s sugar-based model	Strategic for energy security and farmer income

Additional Related Concepts

Term	Explanation
Ethanol Blending Program (EBP)	India’s policy initiative to mix ethanol with petrol to reduce crude oil imports and carbon footprint
Bagasse	The fibrous residue left after extracting juice from sugarcane – used as fuel in Brazil’s ethanol plants
Food vs. Fuel Debate	Ethical and economic debate over using food crops for fuel vs. feeding populations
Second-Generation Biofuels	Ethanol from non-food sources like agricultural waste (e.g., straw, husk) – India is investing in this space
Lifecycle Emissions	Emissions over the full production and usage cycle – sugarcane ethanol has lower lifecycle GHGs than corn ethanol

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