Today in our environmental science lecture, we'll discuss urban heat islands. Cities tend to be warmer than surrounding rural areas because concrete and asphalt absorb and re-emit heat. However, a recent study in Melbourne found that increasing tree canopy by just 20% could reduce surface temperatures by up to 4 degrees Celsius. The researchers also noted that green roofs, while helpful for insulation, had a smaller impact on street-level cooling. Interestingly, the study emphasized that the placement of trees is more critical than the total number, as shade on western-facing walls proved most effective during afternoon heat peaks.
❓ 講義によると、メルボルンの研究では都市の暑さを軽減することについて何が分かったのでしょうか？
A. 緑の屋根は、街路レベルでの冷却に最も効果的な方法です。
B. 樹木の被覆率を20%増やすことで、地表温度を最大4度下げることができます。
C. 木の本数は、その場所よりも重要である。
D. 西向きの壁は午後になると日陰が少なくなります。
✅ 正确答案
Increasing tree cover by 20% can lower surface temperatures by as much as 4 degrees.