Today in our environmental science lecture, we're discussing urban green spaces. A recent study in Melbourne found that adding more trees and parks to city centers can reduce local temperatures by up to 4 degrees Celsius during summer heatwaves. Interestingly, the effect was strongest in areas with tall buildings, because trees provided shade and released moisture through transpiration. The study also noted that residents living within 500 meters of a green space reported better mental health, but the temperature benefit was only observed when green spaces covered at least 30% of the neighborhood. So, it's not just about having a few plants; the density matters.
❓ Según la conferencia, ¿qué condición es necesaria para que los espacios verdes reduzcan las temperaturas locales?
A. A. Deben estar ubicados cerca de edificios altos.
B. B. Deberían cubrir al menos el 30% del vecindario.
C. C. Necesitan incluir tanto árboles como parques.
D. D. Deben estar a menos de 500 metros de áreas residenciales.
✅ 正确答案
B. They should cover at least 30% of the neighborhood.