The relationship between population growth and environmental degradation can be easy to understand, but the economic and social impact of that increase is often more difficult to perceive. Population growth also requires increased infrastructure: transport, energy, waste disposal system. More people require more services from police protection to health care. When resources are insufficient for the population (or when the population grows faster than our ability to provide services and resources) resources become scarce. If food is scarce, the population is hungry, if the houses are scarce, ...