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.
❓ 講師は緑化屋根について何と言っていますか？
A. それらは、都市の気温を下げるために反射塗料よりも効果的です。
B. 屋根の温度を大幅に下げることができますが、都市全体への影響は限られています。
C. それらは大規模な建物にとって最も費用対効果の高い方法です。
D. 彼らはエネルギー消費を10〜15パーセント削減します。
✅ 正确答案
They can significantly lower rooftop temperatures but have limited city-wide impact.