This post follows on a previous post here.
How did we get from natures to nature? In a word, nominalism. The many natures of pre-modern science have been transformed into one nature or Nature, reified if not personified as a thing or force or being.
Nominalism is the teaching that universals or qualities or natures do not exist. Only particulars or quantities or individuals exist. And the result is that only one universal or quality or nature is acknowledged to exist, the somewhat mystical universal quality or nature of everything that underlies all the particulars and quantities and individuals.
We can see nominalism in physics and chemistry, with the rise of the atomic model of nature as composed of one kind of atoms, with only different quantities and configurations to differentiate them. We can see nominalism in biology, with the rise of the evolution model of nature as composed of one kind of life, with only different lines of descent to differentiate individuals. We can see nominalism in politics and economics, with the rise of the equalized person interchangeable with any other person.
By why should this one universal or quality or nature exist at all? Why not go all the way and deny any universal or quality or nature? Nominalism has no defense against such a move. And so we are seeing nominalism end in nihilism, the denial of nature altogether.
We are also seeing the rise of an opposite extreme: that every individual is a unique kind of person and that every individual life is a species. If there are no permanent kinds or species, then individuals are the only kinds. Every person has a right to a unique identity, unique treatment, and unique pronouns.