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 parks can reduce surrounding temperatures by up to 4 degrees Celsius during heatwaves. However, the cooling effect depends on the park's size and vegetation density. Smaller gardens with scattered trees have a minimal impact, while larger connected parks with dense canopy create a significant 'cool island' effect. The study also noted that water features, like ponds, enhance cooling but require careful maintenance to avoid mosquito breeding. Interestingly, the researchers suggested that even small rooftop gardens, if networked across a city, could collectively lower average temperatures by 1 to 2 degrees.