Now that's the test of a relationship. "You want me to give birth to a what?" "Tut tut, my dear, it's for The Planet."
We had smaller, less carnivorous, "greener" human beings if I understand that idiotic term correctly, for most of human history. They tended to starve a lot and lead shorter, more miserable, disease-ridden lives. Pass the burgers, please.
Look at it this way. Anyone willing to do that shouldn’t have offspring and they won’t. At least not the human kind.