Humankind itself is the reason. Since bronze age, we mine, use the nature and lower diversity of species. There is nothing you can do about it. People cannot live without using scarce resources, if they aren't in "stone age" stage. People don't want back to stone age. It is nice we have drugs, energy, cars, etc. But it consumes things. There is no possible economic system that can fix it. We need either downgrade to the point of not even using tools made from metals, or we need to scale up and get other planets as a resources.