Today, in our environmental science lecture, we'll discuss urban heat islands. This phenomenon occurs when cities become significantly warmer than surrounding rural areas. The primary cause is the replacement of natural land cover with materials like concrete and asphalt, which absorb and retain heat. Additionally, waste heat from vehicles and air conditioning units contributes. Interestingly, parks and green roofs can mitigate this effect by providing shade and releasing moisture. A recent study in Melbourne showed that increasing tree canopy by 10% could lower city temperatures by up to 2 degrees Celsius during summer. So, urban planning must prioritize green infrastructure.
❓ Según la conferencia, ¿cuál es la causa principal de las islas de calor urbanas?
A. A. Calor residual de vehículos y aire acondicionado
B. B. Reemplazo de la cobertura natural del suelo con materiales que absorben el calor
C. C. Falta de viento en las zonas urbanas
D. D. Mayor reflexión de la luz solar desde los edificios
✅ 正确答案
B. Replacement of natural land cover with heat-absorbing materials