Today in our environmental science lecture, we'll discuss urban heat islands. These are areas in cities that are significantly warmer than surrounding rural areas. The main cause is the replacement of natural surfaces with concrete and asphalt, which absorb and retain heat. Additionally, lack of vegetation reduces shade and evapotranspiration. A key study in Phoenix, Arizona, found that installing reflective roofs on buildings could lower city temperatures by up to 2 degrees Celsius. However, researchers noted that planting more trees in residential neighborhoods had a greater effect on reducing nighttime heat, because trees release moisture and block longwave radiation. This is why many city planners now prioritize green spaces over reflective surfaces.
❓ 강의에 따르면, 피닉스에서 진행된 연구는 도시 열을 줄이는 것에 대해 무엇을 발견했나요?
A. A. 반사 지붕은 야간 기온을 낮추는 데 있어 나무보다 더 효과적이었다.
B. B. 주거 지역에 나무를 심는 것이 반사 지붕보다 야간 열을 더 많이 줄였다.
C. C. 콘크리트와 아스팔트는 자연 표면보다 열을 덜 흡수한다.
D. D. 도시 열섬 현상은 낮에만 발생한다.
✅ 正确答案
B. Planting trees in residential areas reduced nighttime heat more than reflective roofs.