Urban sprawl can lead to a chain reaction of problems as the human population of a regions increases. Which of the following is a problem of urbanization that affects the environment?

- Lack of sufficient sewage facilities can lead to waterborne diseases.
- There are not enough hospitals and social services for the population.
- Heavily paved cities and fewer trees add more heat to the atmosphere.
- Lack of resources can cause food shortages, malnutrition, or starvation.