Which factor increases impervious surfaces and waste production, thereby impacting nonpoint source pollution?

Which factor increases impervious surfaces and waste production, thereby impacting nonpoint source pollution?

• A. Population Growth
• B. Urban Planning
• C. Green Space Expansion
• D. Rural Development

Answer: (A)

Population growth drives more people into an area, which leads to more buildings, roads, parking lots, and other developments. These create impervious surfaces that prevent rain from soaking into the ground, so more water becomes surface runoff. That runoff picks up pollutants like oil, metals, fertilizers, and sediments from streets and buildings and carries them into streams and rivers. At the same time, more people produce more waste, increasing the amount of litter and refuse that can be swept into waterways or overwhelms wastewater systems, contributing to diffuse pollution. Because it directly increases both impervious cover and waste generation, population growth best explains the rise in nonpoint source pollution. Urban planning can influence outcomes, but it isn’t by itself a driver of more impervious surfaces or waste; green space expansion actually reduces impervious surface and pollution, and rural development often entails less dense development than urban growth, so they don’t fit as strongly as the population-driven increase.

Population growth drives more people into an area, which leads to more buildings, roads, parking lots, and other developments. These create impervious surfaces that prevent rain from soaking into the ground, so more water becomes surface runoff. That runoff picks up pollutants like oil, metals, fertilizers, and sediments from streets and buildings and carries them into streams and rivers. At the same time, more people produce more waste, increasing the amount of litter and refuse that can be swept into waterways or overwhelms wastewater systems, contributing to diffuse pollution. Because it directly increases both impervious cover and waste generation, population growth best explains the rise in nonpoint source pollution.

Urban planning can influence outcomes, but it isn’t by itself a driver of more impervious surfaces or waste; green space expansion actually reduces impervious surface and pollution, and rural development often entails less dense development than urban growth, so they don’t fit as strongly as the population-driven increase.