Calculating the cement industry's role in man-made CO2 emissions and global warming

摘要

The total global production of cement is derived from publications by Cembureau and from the Global Cement Report. The total depends on whether production from China's shaft kilns are included: this cement is included in the total here, since shaft kilns not only still produce CO_2, but also burn their fuel less efficiently than rotary kilns. Around 970kg of CO_2 is produced per tonne of clinker produced (see Marchal 2001). With 5 percent addition of gypsum, and widely varying amounts of substitution (but estimated at 5 percent average around the world), the amount of clinker in an 'average' tonne of cement produced is around 900kg. The figure for total man-made CO_2, 6.3+-0.4Bt of C (=23.1Bt of CO_2) production is taken from the IGPCC 2001 report (see bibliography).