Today in our environmental science lecture, we're discussing urban green spaces. A recent study in Melbourne found that parks reduce local temperatures by up to 4 degrees Celsius during heatwaves. However, the benefit depends on tree canopy coverage. Areas with less than 30% canopy showed minimal cooling. Interestingly, the study also noted that the presence of water features, like ponds, had a stronger effect than grass alone. But the most surprising finding was that small, scattered gardens in residential streets were more effective at lowering nighttime temperatures than a single large park. This is because they provide continuous shade and moisture throughout the city.
❓ According to the lecture, what was the most unexpected finding of the study?
A. A. Parks reduce temperatures by 4 degrees Celsius.
B. B. Water features cool the air more than grass.
C. C. Small street gardens cool nighttime temperatures better than one big park.
D. D. Tree canopy coverage below 30% has little effect.
✅ 正确答案
C. Small street gardens cool nighttime temperatures better than one big park.