Today in our environmental science lecture, we'll discuss urban heat islands. As cities grow, concrete and asphalt replace natural surfaces, absorbing more sunlight and releasing heat at night. This makes cities warmer than surrounding rural areas. One surprising factor is the lack of vegetation. Trees provide shade and release moisture through transpiration, which cools the air. In a recent study of a mid-sized city, researchers found that adding green roofs to 20% of buildings could reduce peak summer temperatures by up to 2 degrees Celsius. However, the effect varies with building height and wind patterns. So, while green infrastructure helps, it's not a complete solution.
❓ 講義によると、最近の研究では緑の屋根を追加することについて何が判明したのでしょうか？
A. A. それらは都市の気温に大きな影響を与えない。
B. B. 建物の20%に適用すれば、夏のピーク時の気温を最大2度摂氏下げることができます。
C. C. それらは高層ビルがある都市でのみ効果的である。
D. D. それらは湿度を高め、都市をより暖かく感じさせます。
✅ 正确答案
B. They can reduce peak summer temperatures by up to 2 degrees Celsius if applied to 20% of buildings.