Today in our environmental science lecture, we'll discuss urban heat islands. As cities grow, concrete and asphalt absorb sunlight and re-radiate heat, making urban areas warmer than surrounding rural regions. This effect is intensified by lack of vegetation and waste heat from buildings and vehicles. One solution is green roofs, which can reduce rooftop temperatures by up to 30 degrees Celsius. However, their effectiveness depends on climate and building structure. For instance, in dry regions, irrigation needs may offset benefits. Therefore, planners should consider local weather patterns before implementing such measures.
❓ 강의에 따르면, 녹색 지붕의 주요 한계는 무엇인가?
A. 그들은 대부분의 도시에 설치하기에는 너무 비싸다.
B. 그들의 효과는 지역 기후 조건에 따라 다릅니다.
C. 그들은 여름철 실내 온도를 상승시킵니다.
D. 그들은 토양층의 지속적인 교체를 필요로 한다.
✅ 正确答案
Their effectiveness varies with local climate conditions.