Today we're discussing the impact of urban green spaces. A recent study in Melbourne found that parks reduce local temperatures by up to 4 degrees Celsius during heatwaves. However, this effect is strongest when the park area exceeds 2 hectares and includes a mix of trees and water features. Interestingly, the cooling benefit extends only about 100 meters beyond the park boundary. The researchers also noted that maintenance costs are often underestimated, especially for irrigation and pruning. They recommend prioritizing small, well-connected green corridors over a single large park, as they provide better access for residents and wildlife alike.
❓ According to the lecture, what condition makes urban parks most effective at cooling?
A. A park larger than 2 hectares with both trees and water
B. A park located within 100 meters of residential areas
C. A park with a single large grass area and no trees
D. A park that is maintained with minimal irrigation
✅ 正确答案
A park larger than 2 hectares with both trees and water