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.
❓ 강의에 따르면, 멜버른 연구는 도시 열을 줄이는 것에 대해 무엇을 발견했습니까?
A. 녹색 지붕은 거리 수준의 냉각에 가장 효과적인 방법이다.
B. 나무 덮개를 20% 늘리면 지표 온도를 최대 4도까지 낮출 수 있습니다.
C. 나무의 수가 그 위치보다 더 중요하다.
D. 서향 벽은 오후에 그늘이 덜 진다.
✅ 正确答案
Increasing tree cover by 20% can lower surface temperatures by as much as 4 degrees.