Today in our environmental science lecture, we're discussing urban green spaces. A recent study in Melbourne found that parks with native trees reduce local temperatures by up to 4 degrees Celsius during heatwaves. Interestingly, the cooling effect was strongest within 50 meters of the trees, but it diminished rapidly beyond 100 meters. The researchers also noted that grass areas without shade provided negligible cooling. So, while planting more trees is beneficial, their placement is crucial for maximum impact on city microclimates.
❓ What did the study in Melbourne reveal about the cooling effect of native trees?
A. A. It was strongest within 50 meters of the trees and weakened quickly after 100 meters.
B. B. It was equally effective across all distances up to 100 meters.
C. C. It only occurred during the night in heatwave conditions.
D. D. It was more significant in grass areas than under tree canopies.
✅ 正确答案
A. It was strongest within 50 meters of the trees and weakened quickly after 100 meters.