Environmental science has shown that the global use of concrete has led to significant challenges today and will seriously trouble future generations. Nevertheless, international building industries advertise concrete as a natural, regional, sustainable, and hence green material. In 2020, global human-made mass exceeded all living biomass, with concrete accounting for nearly half of it, making it a signal of the Capitalocene. A radical transformation of industrial building culture is asked for, otherwise anthropogenic mass will be three times biomass by 2040.