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?
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A hard Environment multiple-choice question from UPSC Prelims 2025. Attempt it above, then check the correct answer and detailed explanation below.
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Correct answer: B. Both Statement II and Statement III are correct but only one of them explains Statement I
Statements II and III are both correct, but only Statement III explains Statement I — the conversion (calcination) of limestone into lime releases CO2, which is the main reason the cement industry accounts for a large share of global carbon emissions. Mixing silica-bearing clay (II) is a process fact that does not by itself explain the emissions.
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