Today's lecture focuses on the impact of urban green spaces on mental health. A recent study conducted in Melbourne followed 2,000 residents over five years. Participants who lived within 300 meters of a park reported 20% lower stress levels. Interestingly, the size of the green space mattered less than its accessibility. Even small community gardens had a significant effect, provided they were well-maintained and had seating areas. The study also noted that the benefits were stronger for people over 50. However, researchers warned that simply adding more trees does not guarantee results; social factors, like safety and community engagement, play a crucial role.