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.
❓ Согласно лекции, какое условие необходимо для того, чтобы зелёные зоны снижали локальную температуру?
A. A. Они должны располагаться рядом с высотными зданиями.
B. B. Они должны покрывать не менее 30% территории района.
C. C. Им необходимо включать как деревья, так и парки.
D. D. Они должны находиться в пределах 500 метров от жилых зон.
✅ 正确答案
B. They should cover at least 30% of the neighborhood.