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Global warming-one of the major issues we face today-is caused by the emission of greenhouse gases into the atmosphere.The cement industry contributes conservatively 5%-8% of global carbon-dioxide (CO2) emissions, mainly through the decomposition of limestone and combustion of fossil fuels during cement production.With the rapidly increasing demand for advanced civil infrastructure-mainly in China, India, the Middle East, and the developing world-the cement and concrete industries are expected to expand significantly.