Discussion
Portland clinker production emits roughly 800 kg of carbon dioxide per tonne. If a special cement halves that and replaces 10 per cent of world production, what proportion of total cement emissions is saved?
Answer: C
Correct answer: about 5 per cent
Halving the emission on a tenth of production saves \[ 0.10 \times 0.50 = 0.05, \] that is five per cent of the total. The arithmetic is worth doing because it shows the scale of the difficulty: a material that halves emissions must reach a large share of world production before the effect on the total is substantial.
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