Today in our environmental science lecture, we're discussing urban green spaces. A recent study in Melbourne found that parks can reduce local temperatures by up to 4 degrees Celsius during heatwaves. Interestingly, the cooling effect is strongest within 50 meters of the park's edge, but it diminishes rapidly beyond that. The study also noted that trees with large canopies are more effective than grass areas alone, because they provide shade and release moisture through transpiration. However, the researchers emphasized that regular maintenance, such as watering during dry periods, is crucial for these benefits to persist.
❓ According to the lecture, what did the study in Melbourne find about the cooling effect of parks?
A. It is most noticeable close to the park's boundary.
B. It works best when parks are covered entirely with grass.
C. It can lower city temperatures by up to 10 degrees.
D. It disappears completely during heatwaves.
✅ 正确答案
It is most noticeable close to the park's boundary.