A green roof provides which environmental benefits?

• A. It reduces energy use, manages stormwater, and supports biodiversity.
• B. It has no effect on energy use or biodiversity.
• C. It increases energy use but reduces maintenance costs.
• D. It reduces biodiversity and increases stormwater runoff.

Answer: (C)

Green roofs provide environmental benefits by improving insulation, reducing stormwater runoff, and expanding urban biodiversity. The insulation helps lower energy use by reducing heating and cooling needs. The soil-vegetation layer stores rainwater and slows its release, which reduces peak runoff and helps manage stormwater. Plants create habitats that support birds, insects, and other organisms, boosting biodiversity in the urban landscape. The other statements don’t align with how green roofs work: energy use is typically reduced rather than increased, biodiversity is enhanced rather than diminished, and stormwater runoff is reduced rather than heightened. While maintenance costs can vary, the main environmental benefits come from energy savings, stormwater management, and biodiversity support.