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.
❓ According to the lecture, what was the main finding about green roofs in Melbourne?
A. A. They were more effective than street trees in reducing heat.
B. B. They increased biodiversity but had little effect on urban heat.
C. C. They reduced ground-level temperatures by 2 degrees Celsius.
D. D. They were less beneficial for insects and birds than expected.
✅ 正确答案
B. They increased biodiversity but had little effect on urban heat.