雅思阅读

📖 Reading Passage

The phenomenon of urban heat islands (UHIs) has become a critical concern in environmental science, as cities increasingly experience higher temperatures than surrounding rural areas. This thermal disparity primarily arises from the replacement of natural landscapes with impervious surfaces such as concrete and asphalt, which absorb and re-radiate solar energy. Additionally, anthropogenic heat emissions from transportation, industrial processes, and air conditioning systems exacerbate the effect. Recent studies have highlighted the role of urban vegetation in mitigating UHIs, as trees and green spaces provide shade and facilitate evapotranspiration, thereby cooling the air. However, the effectiveness of such green infrastructure depends on factors like climate zone, urban density, and seasonal variations. For instance, in arid regions, water scarcity limits the viability of extensive planting, whereas in temperate zones, strategic placement of parks can significantly lower local temperatures. Understanding these nuances is essential for urban planners seeking sustainable solutions to combat rising global temperatures.