Professor: Today we’re going to talk about the concept of “environmental footprint” and how it applies to urban planning. Most people think of a footprint in terms of carbon emissions, but urban planners also consider water usage, waste production, and even the heat island effect. In many older cities, the infrastructure was built before we understood these impacts, so retrofitting is a major challenge. For example, in Boston, they’ve been working on replacing impermeable surfaces with permeable pavements that allow rainwater to filter into the ground, reducing runoff and flooding. However, this is expensive and requires coordination between multiple agencies. Some cities, like Portland, have taken a more community-based approach, encouraging residents to plant green roofs and rain gardens. Interestingly, a recent study found that even small changes, like painting rooftops white to reflect sunlight, can significantly lower a city’s overall temperature. So, the key is not just about large-scale projects, but also about incremental changes that add up over time.
❓ 题目 What is the professor’s main point about reducing a city’s environmental footprint?
A. It requires large-scale infrastructure projects to be effective.
B. It involves both costly retrofits and small, cumulative community actions.
C. It is most successful when only one agency manages the process.
✅ 正确答案
It involves both costly retrofits and small, cumulative community actions.
