Today in our environmental science lecture, we'll discuss urban heat islands. Cities tend to be warmer than surrounding rural areas because concrete and asphalt absorb and re-emit heat. However, a recent study in Melbourne found that increasing tree canopy by just 20% could reduce surface temperatures by up to 4 degrees Celsius. The researchers also noted that green roofs, while helpful for insulation, had a smaller impact on street-level cooling. Interestingly, the study emphasized that the placement of trees is more critical than the total number, as shade on western-facing walls proved most effective during afternoon heat peaks.
❓ Según la conferencia, ¿qué descubrió el estudio de Melbourne sobre la reducción del calor urbano?
A. Los techos verdes son el método más eficaz para el enfriamiento a nivel de calle.
B. Aumentar la cobertura arbórea en un 20% puede reducir las temperaturas superficiales hasta en 4 grados.
C. El número de árboles importa más que su ubicación.
D. Las paredes orientadas al oeste reciben menos sombra por la tarde.
✅ 正确答案
Increasing tree cover by 20% can lower surface temperatures by as much as 4 degrees.