and only a few millions a year out of Earth’s eight billion population When Asimov wrote that, a population of eight billion some time in the future was unbeli

and only a few millions a year out of Earth’s eight billion population When Asimov wrote that, a population of eight billion some time in the future was unbelievably huge. Now, it's still unbelievably huge, but all those people exist. Too many people for the Earth to sustainably keep.