Today, in our environmental science lecture, we'll discuss the impact of urban green spaces. A recent study in Melbourne found that adding more parks and trees can reduce the city's temperature by up to 4 degrees Celsius during heatwaves. This cooling effect is mainly due to shade and evapotranspiration. However, the study also noted that the benefits are strongest when green spaces are evenly distributed, rather than concentrated in a few wealthy areas. Interestingly, the researchers emphasized that even small community gardens can have a significant impact, but they need to be maintained properly to ensure long-term effectiveness.
❓ According to the lecture, what did the study in Melbourne find about urban green spaces?
A. A. They can lower city temperatures by up to 4 degrees during heatwaves.
B. B. They are most effective when concentrated in central business districts.
C. C. They have no significant impact unless they are large parks.
D. D. They mainly help reduce air pollution rather than temperature.
✅ 正确答案
A. They can lower city temperatures by up to 4 degrees during heatwaves.