Today we're discussing the impact of urban green spaces. A recent study in Melbourne found that parks can reduce local temperatures by up to four degrees Celsius during heatwaves. Interestingly, the effect is strongest when parks are larger than two hectares and include a mix of trees and open grass. The study also noted that residents living within 500 meters of a green space reported better sleep quality, possibly due to cooler nights. However, the researchers warned that simply planting more trees in streets may not have the same cooling benefit, as pavement retains heat. They recommend prioritizing large, connected green areas in city planning.
❓ Según la conferencia, ¿qué condición es necesaria para que los parques urbanos tengan el efecto de enfriamiento más fuerte?
A. Deben estar ubicados a menos de 500 metros de zonas residenciales.
B. Deben ser más grandes de dos hectáreas y tener vegetación mixta.
C. Necesitan incluir un lago grande o una fuente de agua.
D. Deberían plantarse con árboles de calle en un patrón lineal.
✅ 正确答案
They should be larger than two hectares and have mixed vegetation.