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State whether the following is true or false.
Replacing clinker with fly ash reduces the carbon dioxide emitted per tonne of cement.

  • A.True only at large scales
  • B.False only at small scales
  • C.True
  • D.False

Answer: C

Most of the emission comes from calcining limestone and burning fuel to make clinker, so any replacement cuts it proportionately. This is the most widely used route to lower-carbon cement. It also puts an industrial by-product to use rather than landfilling it.

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