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 more than vegetation does. One key solution is increasing green spaces, such as parks and green roofs. However, a recent study in a mid-sized city found that while parks reduce local temperatures by up to 2 degrees Celsius, green roofs have a smaller effect, mainly because they are often limited in size. The study also highlighted that planting street trees is more cost-effective than building underground cooling systems, which are expensive to maintain.
❓ Según la conferencia, ¿qué descubrió el estudio reciente sobre los techos verdes?
A. Son más efectivos que los parques en reducir las temperaturas.
B. Tienen un efecto de enfriamiento limitado debido a su pequeño tamaño.
C. Son más baratos que plantar árboles en las calles.
D. Funcionan mejor en áreas rurales.
✅ 正确答案
They have a limited cooling effect due to their small size.