Today in our environmental science lecture, we'll discuss urban green spaces. A recent study in Melbourne found that parks can reduce local temperatures by up to 4 degrees Celsius during heatwaves. However, the effect depends on tree canopy coverage. Areas with less than 30% canopy showed minimal cooling. Interestingly, small pocket parks with dense trees were more effective than larger open lawns. The study also noted that residents living within 500 meters of a green space reported better mental health. But researchers warned that simply adding grass without trees does little to combat urban heat, and recommended prioritizing tree planting in disadvantaged neighborhoods.
❓ Según la conferencia, ¿qué condición es necesaria para que los parques urbanos reduzcan significativamente las temperaturas locales?
A. A. El parque debe tener más de 500 metros de diámetro
B. B. El parque debería tener al menos un 30% de cobertura de copa arbórea.
C. C. El parque debe estar ubicado en un vecindario desfavorecido
D. D. El parque debería tener césped abierto en lugar de árboles densos.
✅ 正确答案
B. The park should have at least 30% tree canopy coverage