I suspect this is more as a way to justify the mass graves that are coming in some of these leftist-run shitholes than it would be "for the environment" or as a lead in to farming humans as a food source.
After all, now you can find human skeletal remains in a place not known to be a cemetery, and the powers that be can justify a lack of response to the find as, "oh, somebody just composted grandpa out there".