asked Her Majesty's Government:
What assessment they have made of the amount of carbon dioxide and other greenhouse gases emitted in the production of one tonne of cement; and what is the estimated total emission of carbon dioxide in the production of cement in the United Kingdom and the European Union.
The UK calculates emissions from cement production as part of the greenhouse gas inventory. Emissions occur both from fuel combustion in the cement sector to provide heat for the calcination process, and from the calcination process itself.
Emissions of CO2 in 2004 from fuel combustion in the cement industry amounted to 4,661.6 thousand tonnes and emissions associated with the cement production process were 5,455.7 thousand tonnes. This equates to a total emission of 10,117 thousand tonnes of CO2. Total clinker (the main raw material for making cement) production was 10,813 thousand tonnes—emissions of carbon dioxide from the UK cement industry in 2004 were therefore approximately 0.94 tonnes per tonne of clinker produced.
Comparable emissions from fuel combustion are not available for the EC or for other European countries, since these are reported combined with other sectors as "other industry".
Emissions associated with the calcination process, however, are available. The table below contains emissions of CO2 for a number of European countries, together with the amount of clinker produced, wherever this is available. The total report in the EC greenhouse gas inventory is also included in the table. The fourth column contains the "IEF" (implied emission factor)—this is the amount of CO2 emitted (thousand tonnes, kt) per thousand tonnes (kt) of clinker produced. This value is slightly lower for the UK than elsewhere.
|Clinker produced (kt)||CO2 emission (kt)||IEF (kt/kt)|
Other greenhouse gases are not emitted as part of the production process, only as a result of the associated fuel combustion. Emissions of methane and N2O are small—0.54 thousand tonnes and 0.17 thousand tonnes in 2004, respectively.