Here on HN we need to back such affirmations with data. The bolder the affirmations, the more solid the data-backed proof need to be.

If we were to exchange "philosophical" considerations here, I'd tell you that sunday fishermen have complained weekly that there was much more fish in the river before since the dawn of humanity. I'd also tell you that my own home in downtown Beijing has seen a slug invasion this year, and that these animals are not disappearing at all (at least in my courtyard).