Today in our environmental science lecture, we're discussing urban green spaces. A recent study in Melbourne found that parks reduce local temperatures by up to 4 degrees Celsius during heatwaves. However, the benefit depends on tree canopy coverage. Areas with less than 30% canopy showed minimal cooling. Interestingly, the study also noted that the presence of water features, like ponds, had a stronger effect than grass alone. But the most surprising finding was that small, scattered gardens in residential streets were more effective at lowering nighttime temperatures than a single large park. This is because they provide continuous shade and moisture throughout the city.
❓ Según la conferencia, ¿cuál fue el hallazgo más inesperado del estudio?
A. A. Los parques reducen las temperaturas en 4 grados Celsius.
B. B. Las fuentes de agua enfrían el aire más que el césped.
C. C. Los pequeños jardines callejeros enfrían mejor las temperaturas nocturnas que un gran parque.
D. D. Una cobertura de copa de árbol inferior al 30% tiene poco efecto.
✅ 正确答案
C. Small street gardens cool nighttime temperatures better than one big park.