This short contribution was sent to us by Anita Mašek, Slovenian Forestry Institute.
How can a city benefit from trees? As calculated by Dan Burden, growing trees might be the best long-term investment for a city – a single street tree returns over 80,000 € of direct benefits in its lifetime. Here's a quick look at some of the most prominent positions for hiring trees that research has thrown light upon so far.
Estimates show that over a 50-year lifetime, a tree provides more than 50,000 € worth of air pollution control."
Trees increase property values
This is not surprising as trees create a tapestry of color, fragrance and interesting form that changes throughout the year, screen unattractive views and soften the harsh contours of buildings. Trees help residential and commercial properties to rent more quickly and to have a higher occupancy rate. They can add up to 15 percent to residential property value and where the entire street is tree-lined, homes may be worth 25% more.
Trees increase business and commercial activity
An abundant tree canopy can attract new residents, tourists and businesses into a neighbourhood. Studies show that people like to spend more time and money in districts with more trees. In addition, having offices with a view of nature and access to green areas during breaks translates into healthier, more productive and satisfied employees.
Trees reduce energy expenditure
Strategically placed trees around a building can reduce summer cooling costs by as much as 30%, while in winter heating costs can be reduced by a similar percentage with the use of trees as windbreaks. A tree is a natural air conditioner and can produce the cooling effect of ten room-size, residential air conditioners operating 20 hours a day. Neighbourhoods well-shaded with street trees can be up to 6-10 degrees cooler.
Trees reduce water management costs
Trees reduce stormwater management costs and produce better water quality. They act as natural water filters and prevent harmful land pollutants contained in the soil from getting into our waterways. They significantly slow the movement of stormwater, which lowers total runoff volume, soil erosion and flooding.
Trees reduce costs for meeting regulatory pollution requirements
Trees contribute to meeting a city’s regulatory clean air requirements by capturing more than 60% of the particulate air pollution. They remove dust, particulates, absorb ozone, carbon monoxide, sulfur dioxide and other pollutants. Estimates show that over a 50-year lifetime, a tree provides more than 50,000 € worth of air pollution control. Trees also act as sound buffers and reduce noise pollution by absorbing and blocking more than 40% of urban noise.
Trees reduce health care costs
Trees catch air pollutants that damage human lungs which enhances a community's respiratory health and ameliorates respiratory problems, such as asthma. They provide protection against ozone-associated health issues. Studies show that hospital patients with a view of trees out their windows recover much faster and with fewer complications. Time spent in nature not only promotes greater physical activity, but also reduces stress, eye strain and lowers blood pressure.
Trees increase security and strength of a community
Trees lower anxious and violent behaviour - the greener the neighbourhood, the lower the crime rate. In homes surronded by trees there is less domestic violence and child abuse than in barren conditions. Trees also create a physical barrier between the street and the sidewalk, keeping pedestrians, children and pets out of harm’s way. Urban nature creates popular meeting places, inviting citizens to spend time together relaxing, walking, jogging or playing. These activities encourage interaction, bring neighbours together and strengthen urban communities.
As shown, urban trees provide a wide array of solutions to a city's welfare and resilience. A city with an abundance of trees is a rich, sociably stable, safe and healthy city.
Foto: K. Kendall
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