I find it so surprising that around 70 percent of all human made resources such as concrete are made AFTER 1990. I mean 1990 is fairly a recent time and I don’t think we have experienced much of environmental changes. Where are all they? Do they mostly come from developing countries?
I find it so surprising that around 70 percent of all human made resources such as concrete are made AFTER 1990. I mean 1990 is fairly a recent time and I don’t think we have experienced much of environmental changes. Where are all they? Do they mostly come from developing countries?