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. For example, a 2022 survey in London found that residents living within a 10-minute walk of a park reported 20% lower anxiety scores compared to those without such access. However, the benefits are not automatic; the quality of the green space matters. Spaces with diverse vegetation and quiet areas are more effective than simple grassy fields. Also, community involvement in maintaining these areas enhances their positive effects.