Sentences with phrase «cement manufacture releases»
Cement manufacture releases CO2 without changing O2.
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During that same period, 282 PgC were released by combustion of fossil fuels, and 5.5 additional PgC were released to the atmosphere from cement manufacture.
About 900 kg of CO2 are released during the manufacture of each tonne of cement (see CO2 and wind turbine concrete).
So 2000 cubic metres of concrete weighs about 5000 tonnes and would contain about 550 tonnes of cement (and this would release about 500 tonnes of CO2 during manufacture).
The Information Unit on Climate Change, Switzerland, states that about a half a tonne of carbon dioxide is released from the roasting of the raw materials for each one tonne of cement manufactured.
Recent estimates have calculated that 26 percent of all the carbon released as CO2 from fossil fuel burning, cement manufacture, and land - use changes over the decade 2002 — 2011 was absorbed by the oceans.