Today we're discussing the impact of urban green spaces. A recent study in Melbourne found that adding more trees to city streets can reduce summer temperatures by up to 4 degrees Celsius. However, the researchers noted that the effect is most significant in areas with high building density. They also observed a 12% increase in local bird species diversity within two years of planting. Interestingly, the study showed that residents reported better mental health when they had daily visual contact with greenery, even if they didn't physically visit the parks. The key factor, according to the lead author, was the frequency of visual exposure rather than the size of the green area.