I stopped reading riiiiiiiiight there.
The greatest existential threat facing humanity? Other varieties of humanity.
The world is a highly resilient piece of real estate. Species come and go, and the huge homeostasis that has kept the planet revolving and swinging in its orbit about the sun, has not been affected one whit by the presence or absence of all these species.
Humanity is the one species known to prey upon other factions of humanity, for reasons so arcane as to escape all logic and consequential connections. Not for food, not for females, not for territory, but simply to have the “right” to assert the opponent is just wrong, and for that, must be enslaved or put to death.
Lord preserve us from righteous men.