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, one surprising factor is the role of green spaces. A recent study in Melbourne found that parks can reduce local temperatures by up to 4 degrees Celsius, but only if they are larger than 2 hectares. Smaller gardens have a negligible effect. Additionally, the study showed that trees along streets are more effective at cooling than grassy areas, due to shade and evapotranspiration. This has implications for city planning, especially in densely populated districts.
❓ 講義によると、メルボルンの研究は緑地について何を見出したのでしょうか？
A. 2ヘクタール未満の公園は、気温を大幅に低下させる。
B. B) 街路樹は草地よりも冷却効果が高い。
C. C) 緑地は都市のヒートアイランド現象に影響を与えない。
D. D) 大規模な公園は、地域の気温を最大4度上昇させる。
✅ 正确答案
B) Street trees are more effective at cooling than grassy areas.