Examine the saturated thickness levels between 1975 and 1990 and between 1995 and 2010. Each of these are fifteen-year spans, but the decrease in saturated thickness is not the same. Even if the population were to stay the same over this time, why do you think the drop in thickness is not as great?

Even if the population were to stay the same over this time, I think the drop in thickness is not as great because the situation is already prevented by a number of solutions. It is said that e ach of these are fifteen-year spans, but the decrease in saturated thickness is not the same, meaning that in that span, people find ways to prevent the thickness from increasing.