That’s the part everybody seems to be glossing over. These stones were supposed to be read by a burgeoning society post apocalypse, not our current world with 8 billion people. The non-existent world these stones speaks to would contain presumably less than the 500,000,000 people its author states is the maximum, and acts as a warning along the lines of ‘don’t destroy the Earth’s environment like we did, that’s what lead to our downfall, too many people’. Not to say that take is correct or not, just what I thought when reading about the stones the first time. Seems like environmentally political rhetoric to me.