雅思阅读

📖 Reading Passage

The phenomenon of urban heat islands (UHIs) has garnered significant attention in climate research due to its implications for energy consumption and public health. UHIs occur when metropolitan areas experience higher temperatures than their rural surroundings, primarily because of the prevalence of dark surfaces, such as asphalt and rooftops, which absorb solar radiation, and the scarcity of vegetation, which reduces evaporative cooling. A recent study by Zhao et al. (2023) analyzed temperature data from 50 global cities and found that the intensity of UHIs is strongly correlated with city size and population density, but also with local climate conditions. For instance, cities in arid regions exhibit more pronounced UHI effects during summer nights, whereas humid coastal cities show moderate effects. The authors argue that effective mitigation strategies, such as increasing green infrastructure and promoting reflective building materials, must be tailored to local climatic contexts rather than adopting a one-size-fits-all approach.