Today in our environmental science lecture, we'll discuss urban heat islands. Cities tend to be warmer than surrounding rural areas because concrete and asphalt absorb and re-radiate heat. One effective mitigation strategy is increasing green spaces, such as parks and green roofs. However, a recent study found that the cooling effect of parks depends significantly on their size and the density of trees. Small parks with scattered trees provide limited relief, while large, densely wooded parks can lower local temperatures by up to 5 degrees Celsius. Additionally, reflective materials on buildings and pavements can reduce heat absorption, but they are less effective than vegetation in promoting evaporation.
❓ According to the lecture, what did the recent study reveal about parks and their cooling effect?
A. A. All parks, regardless of size, reduce temperatures equally.
B. B. Large parks with dense trees are most effective at cooling.
C. C. Reflective materials are more effective than vegetation.
D. D. Small parks with scattered trees lower temperatures by 5 degrees.
✅ 正确答案
B. Large parks with dense trees are most effective at cooling.