Today in our environmental science lecture, we'll discuss urban heat islands. Cities tend to be warmer than surrounding rural areas because concrete and asphalt absorb and re-emit heat. However, one surprising factor is the role of green spaces. A recent study in Melbourne found that parks can reduce local temperatures by up to 4 degrees Celsius, but only if they are larger than 2 hectares. Smaller gardens have a negligible effect. Additionally, the study showed that trees along streets are more effective at cooling than grassy areas, due to shade and evapotranspiration. This has implications for city planning, especially in densely populated districts.
❓ Según la conferencia, ¿qué descubrió el estudio en Melbourne sobre los espacios verdes?
A. A) Los parques de menos de 2 hectáreas reducen las temperaturas significativamente.
B. B) Los árboles de calle son más efectivos para refrescar que las áreas de césped.
C. C) Los espacios verdes no tienen ningún impacto en las islas de calor urbanas.
D. D) Los parques más grandes aumentan las temperaturas locales hasta en 4 grados.
✅ 正确答案
B) Street trees are more effective at cooling than grassy areas.