托福听力

🎧 听力原文

Listen to part of a lecture in an environmental science class. The professor is discussing the concept of 'urban heat islands'. 'Urban heat islands occur when cities are significantly warmer than surrounding rural areas. This happens because buildings, roads, and other infrastructure absorb and re-emit the sun's heat more than natural landscapes do. For example, dark roofs and asphalt parking lots can reach temperatures up to 90 degrees Fahrenheit on a hot summer day, while nearby parks with trees and grass remain much cooler. Additionally, cities generate their own heat through vehicles, air conditioners, and industrial processes. This extra heat can affect local weather patterns, increasing the frequency of thunderstorms. To combat this, many cities are adopting green roofs, planting more trees, and using reflective materials for pavements. These strategies not only lower temperatures but also reduce energy consumption for cooling, which in turn decreases greenhouse gas emissions. So, addressing urban heat islands is not just about comfort—it's a key part of climate action.'