Today in our environmental science lecture, we'll discuss the impact of urban green spaces. Recent studies show that parks and community gardens can reduce local temperatures by up to 5 degrees Celsius during heatwaves. However, the key factor is not just the size of the green area, but its distribution. Small, scattered green spaces are more effective than one large park because they provide cooling benefits to more residents. Additionally, trees with broad leaves offer better shade than those with narrow leaves. The lecturer emphasizes that city planners should prioritize planting along streets and near buildings, rather than only creating large central parks.