Good morning, everyone. Today, we're going to discuss the role of urban parks in reducing heat island effects. A recent study in Melbourne compared three types of green spaces: small gardens, medium-sized parks, and large forested areas. The researchers measured air temperature during a heatwave. Surprisingly, the small gardens had a cooling effect of only 1 degree Celsius, while the medium parks reduced temperatures by 3 degrees. However, the large forested areas showed the most significant drop, up to 5 degrees, but only if the tree canopy was dense. The study also noted that water features, such as ponds, did not enhance cooling unless combined with shade.
❓ According to the lecture, what was the main finding regarding the cooling effect of green spaces?
A. A. Small gardens were more effective than medium parks.
B. B. Large forested areas with dense canopy provided the greatest cooling.
C. C. Water features alone significantly reduced temperature.
D. D. All green spaces had the same cooling effect.
✅ 正确答案
B. Large forested areas with dense canopy provided the greatest cooling.