Cities can get very hot. Roads and buildings absorb heat, creating an urban heat island. Trees help by providing shade and releasing water vapour. This process, called transpiration, cools the air. In summer, the temperature under a tree can be several degrees cooler than an open street. This reduces the need for air conditioning, saving energy. Planting more trees is a cost-effective way to lower city temperatures. Trees also improve air quality. Their leaves catch dust and smoke. When it rains, these pollutants are washed into the soil. Trees also absorb carbon dioxide and turn it into oxygen.

A large tree can produce enough oxygen for several people. By planting trees along busy roads, we reduce the amount of pollution we breathe. This helps keep our lungs healthy and our air clean. Trees help manage stormwater. Rain often runs off hard surfaces into drains, causing flooding. Trees catch rainwater in their leaves and branches. Some water evaporates before reaching the ground. The rest soaks into the soil around the roots. This reduces the amount of runoff and helps prevent flash floods. A healthy tree canopy can significantly lower the risk of flooding and keep our waterways cleaner.

Trees also improve our wellbeing. Spending time near trees reduces stress and boosts mood. In green neighbourhoods, people exercise more and feel happier. Children who play near trees often concentrate better at school. Trees also make cities look friendlier. Even looking at a tree from a window can help hospital patients recover faster. Urban planners now see trees as essential for community health. Trees provide homes for city wildlife. Birds, insects, and mammals rely on them for food and shelter. A single oak tree can support hundreds of insect species. These insects become food for birds and other animals. Planting native trees creates habitat connections that help wildlife move through the city. Protecting and planting trees is an easy way to boost biodiversity and make our cities greener.

A healthy tree canopy can significantly lower the risk of flooding and keep our waterways cleaner.