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UPSC 2025: Consider the following statements: Statement I: Studies indicate that carbon dioxide emissions from cement industry account for more than 5% of global carbon emissions. Statement II: Silica-bearing clay is mixed with limestone while manufacturing cement. Statement III: Limestone is converted into lime during clinker production for cement manufacturing. Which one of the following is correct in respect of the above statements?
(a)Both Statement II and Statement III are correct and both of them explain Statement I
(b)Both Statement II and Statement III are correct but only one of them explains Statement I
(c)Only one of the Statements II and III is correct and that explains Statement I
(d)Neither Statement II nor Statement III is correct
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Not attemptedCorrect Answer: (b) Both Statement II and Statement III are correct but only one of them explains Statement I
Statement I is true: cement manufacture contributes about 7 percent of global CO₂ emissions. Statement II is correct—Portland-cement raw mix combines limestone with silica-bearing clay. Statement III is also correct and directly explains the large CO₂ release, because calcination converts CaCO₃ in limestone to CaO (lime) while emitting CO₂. Only Statement III, not II, explains the emissions share; therefore option (b) is valid. ([aceee.org](https://www.aceee.org/press-release/2024/03/report-government-and-industry-can-cut-cement-emissions-using-calcined-clays?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2025 Environment & Ecology question?▼
The correct answer is option (b): Both Statement II and Statement III are correct but only one of them explains Statement I. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Climate Change & Greenhouse Gases question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2025, GS Paper 1, as Question 31. It falls under Environment & Ecology > Climate Change & Greenhouse Gases.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Climate Change & Greenhouse Gases?▼
UPSC has asked 34 questions from Climate Change & Greenhouse Gases (under Environment & Ecology) across multiple years. Visit the topic page to see the full list and year-wise trends.