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.
❓ 文章によると、都市ヒートアイランド現象の主な原因は何ですか?
A. A) 都市部における空調システムの使用増加
B. B) 都市の建設材料による太陽放射の吸収と再放出
C. C) 農村地域における植生の不足
D. D) 都市部における人口密度は農村部と比較して高い
✅ 正确答案
B) The absorption and re-emission of solar radiation by urban construction materials
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