My AI says: "There is good evidence that some pollutants can impair human fecundity (the biological ability to conceive), but much weaker evidence that pollutants are the main cause of the big drop in population fertility rates seen across rich countries. At the population level, the largest established drivers are still things like later childbearing, education, contraception, urbanization, housing/cost pressures, and changing family preferences."

Have you got evidence that goes against this?