It means we must safeguard ourselves against environmental disasters. We must build our food reserves for the day when we can no longer get food. We also must limit human reproduction. This has become a fairly common practice in foreign countries. For example, China has strict control over how a couple can conceive and the number of children they can raise.
Birth control is mandatory and provided by the government.
But government regulations create problems in and of themselves. It instills within the population a distrust for their rulers. It also raises the question of how much control over population governments should be allowed to wield. So other avenues must be investigated. Some people believe that the Mars exploration may hold the answer.