American Stonehenge: Monumental Instructions for the Post-Apocalypse

From the guidestone text: "Maintain humanity under 500 million in perpetual balance with nature" ...<p>OK, there are 6 billion humans on the planet now. What plan do these do-gooders intend for the 5.5 B "surplus population"?

<a href="http://en.wikipedia.org/wiki/Georgia_Guidestones" rel="nofollow">http://en.wikipedia.org/wiki/Georgia_Guidestones</a>