Today in our environmental science lecture, we're discussing urban green spaces. A recent study in Melbourne found that adding more parks and trees can reduce local temperatures by up to 4 degrees Celsius during heatwaves. However, the researchers noted that the benefit is only significant when the green area covers at least 30% of a neighborhood. In smaller patches, the cooling effect is minimal, and the cost of maintenance often outweighs the environmental gains. The study also highlighted that native plants require less water and attract more local wildlife, making them a better choice than exotic species for sustainable city planning.
❓ 根据讲座内容，城市绿地要显著降低局部温度，需要什么条件？
A. A. 绿色区域必须包含多种外来植物。
B. B. 绿色空间应靠近水体设置。
C. C. 社区内至少30%的区域必须为绿地所覆盖。
D. D. 维护成本必须低于环境效益。
✅ 正确答案
C. At least 30% of the neighborhood must be covered by green areas.