Today in our environmental science lecture, we'll discuss urban heat islands. Cities tend to be warmer than surrounding rural areas due to concrete and asphalt absorbing sunlight. One surprising factor is that green roofs, which are covered with plants, can reduce rooftop temperatures by up to 30 degrees Celsius. However, their overall effect on city-wide cooling is limited because they cover only a small fraction of building surfaces. Another method, using reflective paints on roofs, has been shown to lower energy consumption for cooling by 10 to 15 percent. While both approaches are beneficial, reflective paints are more cost-effective for large-scale application.
❓ 강사는 녹색 지붕에 대해 무엇이라고 말합니까?
A. 그들은 도시 온도를 낮추는 데 반사 페인트보다 더 효과적입니다.
B. 지붕 온도를 크게 낮출 수 있지만 도시 전체에 미치는 영향은 제한적입니다.
C. 그들은 대형 건물에 가장 비용 효율적인 방법입니다.
D. 그들은 에너지 소비를 10~15퍼센트 줄입니다.
✅ 正确答案
They can significantly lower rooftop temperatures but have limited city-wide impact.