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Listen to part of a lecture in an environmental science class. Professor: Today we're going to talk about urban heat islands. As you know, cities tend to be warmer than surrounding rural areas. This is due to several factors. First, concrete and asphalt absorb and re-radiate heat more than vegetation does. Second, buildings block wind and create canyons that trap heat. Third, waste heat from vehicles and air conditioners adds to the warmth. But there are solutions. One is to increase green spaces, like parks and green roofs. These not only provide shade but also cool the air through evapotranspiration. Another solution is to use reflective materials on roads and roofs, which bounce sunlight back into the atmosphere. A third approach is to plant more trees along streets to provide shade and reduce heat absorption. However, these measures require careful planning and community support. For example, a city may need to change building codes or offer incentives for green roofs. So, while the problem is significant, there are practical steps we can take to mitigate it. Now, let's consider a specific case study...