Urban green spaces, such as parks and community gardens, play a crucial role in modern cities. As populations grow and cities become more densely built, access to natural environments becomes limited. Green spaces help reduce air pollution by absorbing carbon dioxide and releasing oxygen, while also lowering urban temperatures through shade and evapotranspiration. Beyond environmental benefits, these areas provide psychological relief, offering residents a place to relax, exercise, and socialize. Studies have shown that regular exposure to green environments can reduce stress levels and improve overall mental well-being.In addition to health benefits, urban green spaces contribute to social cohesion. They serve as common grounds where people from different backgrounds interact, fostering a sense of community. Economically, proximity to parks often increases property values, making neighborhoods more attractive to residents and investors. However, maintaining such spaces requires careful planning and resources, as cities must balance development with conservation. Despite these challenges, the long-term advantages of preserving and expanding green spaces make them an essential component of sustainable urban development.Which one of the following most accurately characterizes the passage's main point?