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In page Portland cement:

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Overall, with nuclear or hydroelectric power, and efficient manufacturing, CO2 generation can be reduced to 0.7 kg (1.5 lb) per kg cement, but can be twice as high. The thrust of innovation for the future is to reduce sources 1 and 2 by modification of the chemistry of cement, by the use of wastes, and by adopting more efficient processes.[citation needed] Although cement manufacturing is clearly a very large CO2 emitter, concrete (of which cement makes up about 15%) compares quite favourably with other modern building systems in this regard.[citation needed]. Traditional materials such as lime based mortars as well as timber and earth based construction methods emit significantly less CO2.[7]