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 significantly reduce stress levels. For instance, a 2021 survey in London found that residents living within a 10-minute walk of a park reported 20% lower anxiety scores. However, the benefits are not just about proximity. The quality of the green space matters too. Areas with diverse plant life and water features, like ponds or fountains, had a stronger positive effect. Interestingly, the study also noted that even small 'pocket parks' in dense city centers were effective, as long as they provided seating and shade. So, urban planners should prioritize both accessibility and design quality.