雅思听力

🎧 Listening Transcript

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.