Today, in our environmental science lecture, we'll discuss urban heat islands. This phenomenon occurs when cities are significantly warmer than surrounding rural areas. One key factor is the replacement of natural surfaces with concrete and asphalt, which absorb and retain heat. Another contributor is the lack of vegetation, as trees provide shade and release moisture through transpiration. Interestingly, the temperature difference is most pronounced at night, when rural areas cool down faster than urban centers. To mitigate this effect, some cities are implementing green roofs and increasing park spaces. However, these solutions require careful planning and investment.
❓ According to the lecture, what is a primary reason for urban heat islands?
A. A. Excessive use of air conditioning in buildings
B. B. Replacement of natural surfaces with concrete and asphalt
C. C. High levels of pollution from vehicles
D. D. Lack of public transportation systems
✅ 正确答案
B. Replacement of natural surfaces with concrete and asphalt