In today's lecture, we'll discuss the impact of urban green spaces on mental health. A recent study followed 1,000 adults over five years. Participants who visited parks at least once a week reported 20% lower stress levels compared to those who rarely went. Interestingly, the type of activity mattered: those who exercised in green areas showed greater benefits than those who simply walked. The study also found that even small gardens in city centers had a positive effect, though larger parks were more effective for sustained mood improvement. So, the key is regular exposure, not just occasional visits.