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. One major factor is the lack of vegetation, which normally provides shade and cools the air through evapotranspiration. Another contributor is waste heat from vehicles and air conditioning. Interestingly, a study in Phoenix found that painting rooftops white could reduce surface temperatures by up to 20 degrees Celsius, but the effect on air temperature was smaller. However, planting trees along streets proved more effective for lowering pedestrian-level heat, especially in residential areas.
❓ Según la conferencia, ¿qué reveló el estudio en Phoenix sobre los techos blancos?
A. Redujeron más la temperatura del aire que la temperatura de la superficie.
B. B) Tuvieron un mayor efecto en la temperatura de la superficie que en la temperatura del aire.
C. C) Fueron más efectivos que los árboles de calle para reducir el calor que sienten los peatones.
D. D) No tuvieron un impacto significativo en las temperaturas urbanas.
✅ 正确答案
B) They had a greater effect on surface temperature than on air temperature.