The phenomenon of urban heat islands (UHIs) has garnered significant attention in recent decades due to its implications for public health and energy consumption. UHIs occur when metropolitan areas experience higher temperatures than surrounding rural regions, primarily because of the prevalence of concrete and asphalt, which absorb and re-emit solar radiation more effectively than natural landscapes. Additionally, anthropogenic heat from vehicles and air conditioning systems exacerbates the effect. Mitigation strategies, such as increasing vegetative cover and implementing reflective roofing materials, have been proposed; however, their efficacy varies with local climate and urban morphology. Recent studies suggest that a combination of green infrastructure and policy interventions, including building codes that mandate cool roofs, may yield the most substantial reductions in peak summer temperatures, thereby alleviating heat-related mortality and reducing cooling demands.
❓ Según el pasaje, ¿cuál es la causa principal del efecto de isla de calor urbana?
A. A) Mayor uso de sistemas de aire acondicionado en áreas urbanas
B. B) La absorción y re-emisión de la radiación solar por los materiales de construcción urbanos
C. C) Falta de vegetación en las regiones rurales
D. D) Mayor densidad de población en las ciudades en comparación con las zonas rurales
✅ 正确答案
B) The absorption and re-emission of solar radiation by urban construction materials
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