Today, in our environmental science lecture, we'll discuss urban green spaces. A recent study in Melbourne found that parks can reduce local temperatures by up to 4 degrees Celsius during heatwaves. This cooling effect is mainly due to shade and evapotranspiration from trees. However, the researchers noted that the benefit is strongest within 100 meters of the park. Beyond that distance, the temperature difference drops significantly. Also, they observed that larger parks with diverse tree species provide more consistent cooling than smaller, grassy areas. So, for city planners, it's not just about having green spaces, but their size and design matter.
❓ According to the lecture, what did the study in Melbourne find about urban parks?
A. A. Parks only reduce temperatures when they are larger than 100 meters.
B. B. The cooling effect is most noticeable within 100 meters of a park.
C. C. Grassy areas are more effective than tree-covered areas for cooling.
D. D. All parks have the same cooling effect regardless of design.
✅ 正确答案
B. The cooling effect is most noticeable within 100 meters of a park.