The premise of Alternative 3 is simple. The Earth's REAL rulers - in terms of wealth and power - have long realised that overpopulation and environmental degradation will soon make this planet unable to support human society as we know it.
A secret plan as therefore been adopted using unpublicized space technology to relocate selected people to established colonies on Mars via clandestine bases located on The Moon.
Such a plan is apparently only the latest in survival schemes for the ruling Elite - who for some time have realised that mankind's excesses on this planet have for some time passed beyond the point of redemption.