Today we're discussing the impact of urban green spaces. A recent study in Melbourne found that parks and community gardens can reduce the urban heat island effect by up to 4 degrees Celsius. However, the effectiveness depends on the size and density of trees. For instance, small gardens with scattered trees have minimal cooling, while large connected parks with dense canopy can lower temperatures significantly. The study also noted that green roofs are less effective than ground-level parks for cooling, but they do help with stormwater management. Finally, researchers emphasized that regular maintenance is crucial, as unkempt vegetation can actually increase local temperatures by trapping heat.