Which is a benefit of using green roofs in urban environments?

Using green roofs in urban environments significantly enhances stormwater management. These roofs are designed to absorb and retain rainwater, which reduces runoff and helps mitigate flooding. The vegetation and growing medium on a green roof act as a sponge, capturing rainfall and allowing it to infiltrate slowly. This process not only lessens the burden on urban drainage systems but also improves water quality by filtering pollutants before they reach waterways.

In contrast, other options present drawbacks. Increased heat retention can create urban heat islands, while higher maintenance costs don't align with the benefits green roofs provide in energy savings and environmental quality. Additionally, decreased biodiversity is a concern in urban settings; however, green roofs can actually promote greater biodiversity by providing habitats for various species of plants and animals. Thus, improving stormwater management stands out as a key benefit of implementing green roofs in cities.