Today in our environmental science lecture, we're discussing urban green spaces. A recent study in Melbourne found that adding more parks and trees in city centers can reduce local temperatures by up to 3 degrees Celsius during summer heatwaves. This cooling effect is mainly due to shade and evapotranspiration. Interestingly, the study also noted that while green roofs are effective for insulation, they have less impact on street-level temperature compared to street trees. The researchers recommend prioritizing tree planting along busy roads and near residential buildings, as these areas benefit most from reduced heat exposure. However, they warned that water availability is a key constraint in drier climates, so sustainable irrigation systems must be considered.
❓ According to the lecture, what did the study in Melbourne find about street trees compared to green roofs?
A. A) Street trees are more effective at lowering street-level temperatures.
B. B) Green roofs provide better insulation but also reduce street heat.
C. C) Both are equally effective in reducing urban temperatures.
D. D) Green roofs are more beneficial for residential buildings.
✅ 正确答案
A) Street trees are more effective at lowering street-level temperatures.