Joe is very astute. I agree that some modern situations could easily lead to a population decline far more steep and sudden than what's depicted in the article about current trends in Japan. For example: declining sperm count owing to pesticides in the food, excessively zealous vaccination programs, and radioactive damage, all can cause further reduction in fertility. A sudden worldwide economic collapse could easily cause starvation of billions of people. And even worse than that, a thermonuclear war could be followed by "nuclear winter" and worldwide crop failure, leaving only a tiny remnant of humanity at best.Joe says there in a hurry and they are killing us off faster and faster.
....When the big boys in the 90s told us. 500 million people was the plan they used the world optimum population!
But, the concept of "they" and/or "the big boys" is oversimplified. The elite consists of individuals and factions who might (and indeed probably do) have varying opinions about the rapidity of population decline they would like to see. There might also be controversy about the methods they would be willing to use. Even if policy is basically decided by some person who is the King (or Queen) of the World, that person faces challenges to get his or her policy implemented.
Notice that Robert Christian makes the claim above, "I am the originator of the Georgia Guidestones and the sole author of its inscriptions." His shadowy backers would presumably not have provided "assistance" if they weren't generally in agreement with the sentiments expressed. If indeed there is a numerological link to the Burj Khalifa, then the design and funding of the monument might have very deep connections to elite world power.
Yet at the same time, RC Christian might be solely responsible for coming up with the arbitrary 500 million figure, just as he is implicitly claiming in his book.