1. Cement Statistics and Information (USGS, 2015);
http://minerals.usgs.gov/minerals/pubs/commodity/cement/index.html
2. Boden, T. A., Marland, G. & Andres, R. J. Global, Regional, and National Fossil-Fuel CO2 Emissions (Carbon Dioxide Information Analysis Center, 2014).
3. CO 2 Emissions From Fuel Combustion (International Energy Agency, 2014).
4. Barcelo, L., Kline, J., Walenta, G. & Gartner, E. Cement and carbon emissions. Mater. Struct. 47, 1055–1065 (2014).
5. Pade, C. & Guimaraes, M. The CO2 uptake of concrete in a 100 year perspective. Cement Concr. Res. 37, 1348–1356 (2007).