I read this one in the 1990's. Basically, it starts out that the smart people of earth decide to get rid of the dumb people by tricking them into believing they are repopulating a new planet. The smart people revel in their evilness. However, soon they die out from starvation and disease because there is no one left on earth who can cook or clean for them. The dumb people are what remains of the human race to start a new planet. Would love to share with my kids. Thanks!