Today in our environmental science lecture, we're discussing the impact of urban development on local wildlife. One key example is the city of Melbourne, where planners introduced green roofs on new buildings. These roofs, covered with plants, provide habitats for insects and birds. However, a study found that while green roofs increased biodiversity, they did not significantly reduce the urban heat island effect. Instead, the most effective measure was planting street trees, which lowered ground-level temperatures by up to 2 degrees Celsius. The lecturer emphasizes that future policies should prioritize street trees over green roofs for cooling, but combine both for ecological benefits.
❓ 根据讲座内容，关于墨尔本绿色屋顶的主要发现是什么？
A. A. 它们在降温方面比街道树木更有效。
B. B. 它们增加了生物多样性，但对城市热岛效应影响甚微。
C. C. 它们使地面温度降低了2摄氏度。
D. D. 它们对昆虫和鸟类的益处低于预期。
✅ 正确答案
B. They increased biodiversity but had little effect on urban heat.