Today we're discussing the impact of urban green spaces on mental health. A recent study conducted in Melbourne followed 1,000 residents 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 size of the park mattered less than the variety of plants and trees. Researchers also noted that even short visits of 15 minutes had measurable benefits. However, the effect was stronger for people who engaged in activities like walking or jogging rather than sitting passively. The study suggests that city planners should prioritize biodiversity in small local parks.