Today in our environmental science lecture, we'll discuss urban heat islands. As cities grow, concrete and asphalt absorb sunlight and re-radiate heat, making urban areas warmer than surrounding rural regions. One key factor is the lack of vegetation. Trees and green spaces provide shade and cool the air through evapotranspiration. A study in Melbourne found that increasing tree canopy by 20% could reduce peak summer temperatures by up to 4 degrees Celsius. Additionally, using reflective materials on rooftops and pavements can lower heat absorption. However, the most cost-effective solution remains planting more trees, especially in densely built neighborhoods.
❓ Theo bài giảng, cách tiết kiệm chi phí nhất để giảm nhiệt đô thị là gì?
A. Sử dụng vật liệu phản chiếu trên mái nhà
B. Trồng thêm nhiều cây xanh trong các khu vực đô thị hóa