Today, in our environmental science lecture, we'll discuss urban heat islands. These are areas in cities that are significantly warmer than surrounding rural regions. One major cause is the replacement of natural surfaces with concrete and asphalt, which absorb and retain heat. Another factor is the lack of vegetation, as trees provide shade and release moisture through transpiration. Interestingly, the temperature difference can be as much as 5 to 10 degrees Celsius at night. To mitigate this effect, some cities are implementing green roofs and increasing urban tree cover. However, these solutions require careful planning and investment.
❓ According to the lecture, what is one major cause of urban heat islands?
A. A. The use of air conditioning in buildings
B. B. The replacement of natural surfaces with concrete and asphalt
C. C. The increase in vehicle emissions
D. D. The lack of rainfall in urban areas
✅ 正确答案
B. The replacement of natural surfaces with concrete and asphalt