“According to the World Business Council for Sustainable Development (WBCSD
www.WBCSD.org),
‘
Concrete is the most widely used material on earth apart from water, with nearly three tons used annually for each man, woman, and child.’ ”
“Carbon dioxide emissions from a cement plant are divided into two source categories: combustion and calcination. Cobustion accounts for approximately 40% and calcination 60% of the total CO2 emissions from a cement manufacturing facility. ”
“The manufacture of cement produces about 0.9 pounds of CO2 for every pound of cement.
Since cement is only a fraction of the constituents in concrete, manufacturing a cubic yard
of concrete (about 3900 lbs) is responsible for emitting about 400 lbs of CO2.”
http://www.greenrationbook.org.uk/resources/footprints-concrete/
(20min delay)