>>16788673 (OP)
Exterminating retards.
Its simple.
Agree upon a test which measures intelligence, general knowledge and critical thinking skills. Set the pass rate so only half the population pass the test. Anyone who fails the tests gets turned into fertilizer. Bumper crops!
Follow this up with composting the lazy, the mentally ill, anyone belonging to a religion.
Repeat this every twenty years.
Moon base within this century. Interstellar space flight next century. Mass colonization of the galaxy soon after that.