Today in our environmental science lecture, we'll discuss urban heat islands. As cities grow, concrete and asphalt replace natural surfaces, absorbing more sunlight and releasing heat at night. This makes cities warmer than surrounding rural areas. One surprising factor is the lack of vegetation. Trees provide shade and release moisture through transpiration, which cools the air. In a recent study of a mid-sized city, researchers found that adding green roofs to 20% of buildings could reduce peak summer temperatures by up to 2 degrees Celsius. However, the effect varies with building height and wind patterns. So, while green infrastructure helps, it's not a complete solution.
❓ Según la conferencia, ¿qué descubrió el estudio reciente sobre la adición de techos verdes?
A. A. No tienen un impacto significativo en las temperaturas urbanas.
B. B. Pueden reducir las temperaturas máximas del verano hasta en 2 grados Celsius si se aplican al 20% de los edificios.
C. C. Solo son efectivos en ciudades con edificios altos.
D. D. Aumentan la humedad y hacen que las ciudades se sientan más cálidas.
✅ 正确答案
B. They can reduce peak summer temperatures by up to 2 degrees Celsius if applied to 20% of buildings.