Green spaces don’t exist just to beautify urban areas. Trees are the lungs, liver and beating heart of the world’s cities, and they are fundamental to creating healthy, liveable and sustainable cities around the globe.
Trees are an important way to mitigate climate change and improve air quality, making cities healthier places to live in. They’re also critical for places with warm climates. In fact, strategic placement of trees in cities can help to cool the air between two and eight degrees Celsius, making that sticky urban heat just a little more bearable. Large trees are also excellent at absorbing pollutant gases and filtering fine particulates such as dust, dirt or smoke out of the air by trapping them on leaves and bark.
And they’re not just good for the environment – they have positive effects on us humans too. Research shows that living close and having access to green spaces can improve physical and mental health by decreasing high blood pressure and stress, for example.
For all these reasons, it is vital that modern urban planning takes trees seriously. That’s why FAO and the Arbor Day Foundation started the Tree Cities of the World programme, a collaborative effort to encourage cities and towns around the globe to invest in, properly maintain and sustainably manage urban forests and trees. 2019 was the first year of eligibility for this worldwide initiative and 68 cities from 17 countries were recognised for their commitment to urban forestry. The programme has since almost doubled and now includes 120 cities from 23 countries.
Here are some of innovative, inspiring initiatives put in place by four Tree Cities:
Birmingham, United Kingdom
Over the last couple of decades, Birmingham has moved from an industrial city to a green beacon of modern urbanity. It became a Tree City in 2019.
The local government’s “Route to Zero” plan aims to make the city a net zero carbon emitter by 2030. It has focused on creating green corridors and green infrastructure within Birmingham. An example of this is Cole Valley, a park, cycle route and natural space alongside the river, encouraging walking and cycling as part of residents’ commutes.
Alongside this, the “Route to Zero” plan included a project that mapped the city’s tree cover, essential for lowering its summer temperatures. It was found that whilst some areas had canopy cover of 40 percent, some had as little as 10 percent. The council is now focusing on planting trees and creating green spaces across all city districts to get as much of the city as possible up to at least 25 percent canopy coverage, which is the minimum needed to realise heat-reduction benefits.