banning concrete would take us back to pre-Roman times 2,050 years to be safe, worse the Old Kingdom Egyptians likely know how to make polymers of stone. So lets go back 6,000 years to save the planet - its for the childrens !!!
IIRC, after the Romans demise, civilization lost the ability to make “concrete” for a little over 1000 years. Wonder if that made a dent in the climate global change warming equation?