Read Sec 10 of the UN Global Biodiversity Assessment, A document related to Agenda 21 which has been under inplementation by Ex. Order since 1994. Sec. 10 calls for an 80% reduction in human population.
The people who financed and had constructed the Georgia Guidestones only want humanity at 500 million which is a bit higher than an 80% reduction.
http://en.wikipedia.org/wiki/Georgia_Guidestones