Today in our environmental science lecture, we'll discuss urban green spaces. Recent studies show that parks and community gardens can reduce city temperatures by up to 3 degrees Celsius. However, the key factor is not the total area but the distribution. Small, evenly spaced green areas are more effective than one large park. Additionally, trees with broad leaves provide better shade than those with narrow leaves. Interestingly, green roofs on buildings contribute to cooling, but they require significant maintenance. So, when planning a city, we should prioritize accessible green pockets over large, distant parks.
❓ According to the lecture, what is the most important factor for urban green spaces to reduce temperatures?