Today in our environmental science lecture, we'll discuss urban heat islands. A recent study in Melbourne found that parks and green roofs can reduce local temperatures by up to 3 degrees Celsius. However, the effect is strongest within 500 meters of the green area. Interestingly, the cooling benefit is more noticeable at night than during the day, because vegetation releases stored moisture. The study also highlighted that tree canopy coverage is more effective than grass alone. So, for city planners, prioritizing tree planting in densely built areas is key.
❓ According to the lecture, what did the study in Melbourne find about the cooling effect of green areas?
A. A. It is strongest during the daytime.
B. B. It only works within 100 meters of parks.
C. C. It is more noticeable at night and within 500 meters.
D. D. Grass is more effective than tree canopy for cooling.
✅ 正确答案
C. It is more noticeable at night and within 500 meters.