雅思听力

🎧 Listening Transcript

Today in our environmental science lecture, we're discussing urban green spaces. A recent study in Melbourne found that adding more trees to city streets can reduce local temperatures by up to 2 degrees Celsius during summer. However, the researchers noted that the cooling effect depends on tree species and canopy density. For example, broad-leafed trees like oaks provide more shade than narrow-leafed pines. Interestingly, the study also showed that green roofs, while beneficial for insulation, have a smaller impact on street-level temperature than tree canopies. The city now plans to increase tree coverage by 20% by 2030, focusing on residential areas near schools and hospitals.