Today we're discussing the impact of urban green spaces. A recent study in Melbourne found that adding more trees to city streets can reduce summer temperatures by up to 2 degrees Celsius, but only if the trees are planted close to buildings. However, the same study noted that parks with grass alone have a smaller cooling effect. Interestingly, the researchers also discovered that green roofs on high-rise buildings are most effective for energy savings in winter, not summer. So, for maximum benefit, cities should prioritize street trees near residential areas rather than large distant parks.
❓ According to the lecture, what did the study in Melbourne find about street trees?
A. A. They are most effective for energy savings in winter.
B. B. They reduce temperatures only when planted near buildings.
C. C. They have a smaller cooling effect than grass parks.
D. D. They should be planted in large distant parks for best results.
✅ 正确答案
B. They reduce temperatures only when planted near buildings.