How can population growth affect the environment and infrastructure, and what policies support sustainable outcomes?

• A. Growth reduces demand for housing and water.
• B. Policies should restrict urban planning to prevent growth.
• C. Growth only impacts culture, not infrastructure.
• D. Growth raises demand for housing, water, energy; policies include urban planning, public transit, family planning, and investment in services.

Answer: (D)

Population growth changes the scale of demand on housing, water, energy, and the services that keep communities healthy and functioning. As more people need homes, land use and urban form shift, which can affect ecosystems and local environments. Water and energy systems must supply larger populations, and transportation and waste networks face greater strain. Buildings, infrastructure, and services must expand or be upgraded to keep pace, making sustainable planning essential.

The best answer links these pressures to practical policies: planning for higher-density, well-connected urban areas; expanding and improving public transit and other low‑carbon transportation options; supporting family planning to help influence growth trends; and investing in core services—water and sanitation, housing, energy, education, and healthcare—to meet needs while protecting the environment. This combination addresses how growth affects both environment and infrastructure and shows concrete steps to achieve sustainable outcomes.

Other ideas fall short because they either misstate the effects—growth does not reduce demand for housing or water; or they ignore infrastructure impacts—or they suggest restricting planning, which does not provide a workable path to sustainability.