Comment Comment by M95D You need carbon (coal) to make steel from iron.Cement needs lots of heat to make it - from coal too. Also, cement is made from CaCO3 (limestone, the shell of ancient microorganisms). It releases the CO2 it contains when transformed into cement. parent M95D 2 years ago
Cement needs lots of heat to make it - from coal too. Also, cement is made from CaCO3 (limestone, the shell of ancient microorganisms). It releases the CO2 it contains when transformed into cement.