Trees absorb carbon dioxide from the atmosphere, helping to lessen the impact of climate change. Simultaneously, they release oxygen, maintaining the delicate balance of atmospheric gases that support life on Earth.

Estimates of annual air pollution removal by Newton’s total tree canopy:

• Carbon monoxide = 2,848 lbs.

• Nitrogen dioxide = 73,467 lbs.

• Ozone = 208,445 lbs.

• Sulfur dioxide = 15,158 lbs.

• Particulate matter = 36,881 lbs.

This cleaning function is especially important for those living within 500 feet of a highway (Mass Pike, Rte 9, 128)

Source: Newton Climate Vulnerability Assessment and Adaptation and Resiliency Action Plan, pp. 26, 29

https://onetreeplanted.org/blogs/stories/how-trees-clean-air

Trees offer shade that reduces the urban heat island effect, minimizing temperature rise in cities. This cooling effect not only enhances outdoor comfort but also lowers energy consumption, particularly for air conditioning in warmer months.

• Paved vs natural cover: 10+°F higher in daytime, 5+°F higher at night.

• Increased risk of heat-related illnesses.

• More trees = more shade = reduced energy consumption

  • Only 3 trees can save $100–$250 in energy costs annually!

Heat is a business issue too:

• 40% of Newton businesses are in “hot spots”

• ~1800 Newton employees work outside

Source: Newton Climate Vulnerability Assessment and Adaptation and Resiliency Action Plan, p. 21.

The US Environmental Protection Agency’s Green Infrastructure Scorecard (p. 16) recommends that cities give credit for maintaining mature trees (exceeding a certain size) in their stormwater management requirements.

Root systems of trees store water, reducing flood risks, while their networks stabilize soil, preventing erosion and landslides. Additionally, these roots absorb pollutants from runoff, contributing to cleaner surroundings.

source: https://youtu.be/VEBax84XzH4?si=cewv1xXjhC-YhyWi&t=172

How Do Trees Reduce Stormwater and Flooding? https://youtu.be/VEBax84XzH4?si=ba6BGMBBLOz_KSOm

https://extension.psu.edu/how-do-trees-reduce-stormwater-and-flooding

Trees act as natural air filters, purify the atmosphere, and offer green spaces linked to reduced stress and improved mental well-being. Additionally, trees can buffer sounds, resulting in quieter and more serene surroundings.

"The health benefits of trees" Harvard T.H. Chan School of Public Health: https://www.hsph.harvard.edu/news/hsph-in-the-news/the-health-benefits-of-trees/

“Tree Facts,” Arbor Day Foundation, https://www.arborday.org/trees/treefacts/

Also read about Green Heart Louisville, an ongoing grant-funded study to rigorously and scientifically assess the impact of green space on air quality and health in urban communities, https://greenheartlouisville.com/learn/

Trees are integral to sustainable urban planning, functioning as green infrastructure that improves the qualixty of life for city residents. They contribute to environmental health by mitigating pollution, regulating temperature, and promoting overall urban resilience.

Watch this Earth Day webinar “Why Trees Matter for Green Development” (https://tinyurl.com/YTreesMatter) with Senator Ed Markey, State Senator Cindy Creem, climate scientists, and local tree and forest advocates.

Watch this TED talk about how trees made the difference in the survival of ancient cities and why cities today need trees: What happens if you cut down all of a city's trees? - Stefan Al

Natural cover vs. built environment

Properties adorned with well-maintained trees often command higher values due to their visual appeal and the sense of tranquility they bring to surroundings. Moreover, the presence of trees contributes to cost savings by reducing energy consumption and managing stormwater runoff.

Having large trees in yards along streets increases a home’s value from 3 percent to 15 percent. Wolf, Kathleen L, PhD, University of Washington (2007) City Trees and Property Values. Arborist News. 16, 4:34-36.

source: https://www.arborday.org/trees/benefits.cfm

Trees provide habitats for countless species, promoting biodiversity and fostering a healthier ecosystem. Their root systems help prevent soil erosion and act as natural filters, purifying water by absorbing pollutants before they reach water bodies.

Photos by Pete Gilmore

“Urban Trees Are Key to Global Biodiversity,” COP15 Infographic, United Nations Economic Commission for Europe: https://unece.org/sites/default/files/2022-12/COP15_infographic_final.pdf

Beyond their practical benefits, trees hold cultural and historical significance in urban areas, connecting us to our past and enhancing community identity. Their aesthetic value beautifies landscapes and creates inviting spaces for people to gather and appreciate nature. We are fortunate to have many beautiful old trees in Newton that benefit whole neighborhoods. We propose to acknowledge mature trees that meet certain criteria with a “heritage tree,” so that future generations can enjoy their beauty and benefits.