Sourced from Apolitical
The current climate and ecological crisis demands a radical redesign of how we live and organise our societies. Yet these urgent changes, though complex, are far from impossible.
Some of them are simple, beautiful, and beneficial to all. By greening our cities with street trees, urban parks, and community and rooftop gardens, we can keep ourselves cool amid rising temperatures, reverse the steady erosion of the rich tapestry of life on Earth, and foster happiness and social connection in the process.
It is widely known that greenery in urban spaces helps improve city microclimates. Thanks to heat generated by traffic and industrial activity, as well as the spread of heat-trapping concrete buildings that have steadily replaced plant life, urban air temperature is often higher than in rural environments. Hotter cities compel urban denizens to opt for air conditioners in order to stay cool, which further strains energy demands and worsens the urban heat island effect.
Plants can help cool cities through the water that evaporates from their leaves when exposed to the sun’s rays, and by shading surfaces that otherwise might have absorbed heat. Research has found that on a sunny day, a single healthy tree can have the cooling power of more than ten air-conditioning units.
Plants also help keep harmful pollutants such as microscopic particulate matter bay through a complex process known as dry deposition, whereby particles penetrate and become trapped in the wax or cuticles of leaves. Although banning or at least restricting vehicle use in city centres is crucial, mass greening can further reduce pollution and keep cities cool in the increasingly scorching summers that lie ahead.