Urban trees are a critical asset to cities.
Trees sequester carbon, reduce energy usage, remove air pollutants, filter stormwater, and cool hot city streets by providing shade and releasing water vapor.
Health benefits from urban trees
The mental and physical benefits of trees for residents are numerous. A growing body of evidence links exposure to vegetation with reduced rates of mortality, cardiovascular disease, stress, and depression. Living in greener areas is associated with higher levels of happiness, cognitive development, and learning outcomes. These benefits are related to a decrease in exposure to air pollution, noise, and heat, increased contact with nature, and strengthened social cohesion.
Take the example of this London Planetree in East Boston with a diameter of 24 inches. According to the USDA, this tree conserves 1,843 kWh of energy, filters 3,244 gallons of stormwater, stores 3,145 pounds of carbon dioxide, and removes 3 pounds of air pollutants from the neighborhood, saving the city and its residents $117 EVERY YEAR in eco-system benefits only, not to speak of the health and mental benefits. And as this tree grows, so does its contribution to our well being.
Now multiple the benefits of that one tree by thousands, and you see the benefits of our urban forest!
Environmental justice and tree equity in the City of Boston
Trees, because of their aesthetic value, can also increase property values, which creates complications for lower-income communities and can lead to gentrification. While trees can displace residents unable to afford climbing housing costs out of their neighborhood, they are also dangerously absent from these communities.
Beginning in the 1930s, redlining divided urban areas by socioeconomic class and this ultimately resulted in the unequal distribution of tree canopy in Boston. The city’s political red lines have resulted in natural “green lines” today, For example, while neighborhoods such as East Boston have less than 10% canopy coverage, the coverage in Jamaica Plain and West Roxbury nears 50%. Knowing the benefits of trees, it’s no surprise that communities lacking them face hotter summers, poorer air quality, and less livable neighborhoods. Learn more about the distribution of trees and its relationship to people and environment at our Tree Equity map.
To learn more about the benefits of urban trees, we’ve collected our favorite resources below.
Vibrant Cities Lab houses various resources about urban forestry and the benefits urban trees provide. You can access case studies, research articles, and different guides to name a few of the resources.
Boston Public Library’s “LibGuide”: Exploring Trees and Equity in Boston through Literature
Learn about tree and nature equity in Boston and trees in literature and art. Developed in partnership with Speak for the Trees.
Learn more about the various benefits of trees in urban environments, such as fighting climate change and saving energy.
Use this resource to learn more about Tree Equity is why it is so important to create in all cities, including Boston.
Washington Post Article: Deadly air pollutant ‘disproportionately and systematically’ harms Americans of color, study finds
Read this article to learn more about a recently published study on environmental racism with regards to people of color being exposed to higher levels of air pollution than average. (Read the full scientific article here: PM2.5 polluters disproportionately and systemically affect people of color in the United States)
The tree cover and temperature disparity in US urbanized areas: Quantifying the association with income across 5,723 communities
Learn more about the relationship between income and temperature in cities across the United States in this recently published study.
Use this literature review to learn more about how tree cover is associated with improved human health in multiple capacities, especially with proper tree selection.
Find out more about Boston’s tree canopy by reading the City of Boston’s Tree Canopy Assessment which analyzes the change in tree canopy from 2014 to 2019.