Why Trees Matter

Remove carbon dioxide — Through photosynthesis, trees take up CO₂ from the atmosphere and store carbon in their wood, roots, and soil. Because CO₂ is a major greenhouse gas, planting and protecting trees can help mitigate climate change.

Reduce urban heat islands — Urban areas can be several degrees warmer than surrounding rural areas because asphalt and concrete absorb and radiate heat. Trees provide shade and cool the air through transpiration, making streets and neighborhoods more comfortable.

Improve air quality — Trees absorb pollutants such as ozone, nitrogen dioxide, and particulate matter from the air. Their leaves also trap dust and other airborne particles, helping create cleaner air.

Reduce stormwater runoff — Tree canopies intercept rainfall, while roots and soil help absorb and slow water. This reduces the amount of stormwater flowing over streets and into storm drains, rivers, and streams.

Prevent erosion — Tree roots hold soil in place and help prevent it from being washed or blown away. Tree canopies also reduce the impact of raindrops on exposed soil.

Increase biodiversity — Trees provide food, shelter, nesting sites, and habitat for birds, insects, mammals, and other organisms. A diverse collection of trees can support a healthier urban ecosystem.  Native trees support far more wildlife than non native trees.  

Reduce stress — Spending time around trees and other green spaces can help lower stress and promote relaxation.

Encourage walking — Shaded, tree-lined streets are more comfortable and inviting for walking, helping encourage people to be physically active.

Improve mental health — Access to trees and green spaces is associated with improved mood, attention, and overall psychological well-being.

Reduce asthma triggers — Trees can help remove certain airborne pollutants and particulate matter. Choosing appropriate tree species and maintaining trees properly is important because some trees can also produce pollen that triggers allergies.

Create cooler neighborhoods — Shade and cooling from trees can make outdoor spaces more comfortable during hot weather and help reduce exposure to extreme heat