In today's lecture, we'll discuss the impact of urban green spaces on mental health. Recent studies show that access to parks and gardens can reduce stress levels significantly. However, the benefits depend on the quality of these spaces. For instance, areas with diverse plant life and quiet corners are more effective than those with just open lawns. Interestingly, the research also found that even small green spaces, like street trees, can improve mood if they are well-maintained. So, it's not just about quantity but also about thoughtful design.