Why We Should Plant More Trees
412 views 2018-07-18 0
Compiled by: Erv Evans for Trees of Strength, a registered service mark of NC State University
Benefits of Trees
We plant trees primarily for their beauty and to provide shade but they do create many other benefits. Trees can soothe and relax us and help us connect with nature and our surroundings. The color green - is a calming, cool color that helps your eyes quickly recover from strain. By planting and caring for trees, you help improve your surroundings, reduce pollution, lower energy costs, improve the appearance of your community and increase the value of your property.
- Trees can reduce air temperature by blocking sunlight. Further cooling occurs when water evaporates from the leaf surface. The conversion of water to air vapor— a chemical process— removes heat energy from the air.
- A tree can be a natural air conditioner. The evaporation from a single tree can produce the cooling effect of 10 room-size air conditioners operating 20 hours a day.
- You can improve the efficiency of your heat pump by shading it with a tree.
- Deciduous trees block sunlight in the summer but allow sunlight to reach and warm your home in the winter— place deciduous trees on the south and west sides of your home.
- Trees can shade hard surface areas such as driveways, patios, building and sidewalks thus minimizing landscape heat load— a buildup of heat during the day that is radiated at night resulting in warmer temperatures. Ideally, 50 percent of the total paved surface should be shaded.
- Evergreen trees can be used to reduce wind speed and thus loss of heat from your home in the winter by as much as 10 to 50 percent.
- Fallen tree leaves can reduce soil temperature and soil moisture loss. Decaying leaves promote soil microorganism and provide nutrients for tree growth.
- Trees help settle out and trap dust, pollen and smoke from the air. The dust level in the air can be as much as 75 percent lower on the sheltered side of the tree compared to the windward side.
- Trees created an ecosystem to provide habitat and food for birds and other animals.
- Trees absorb carbon dioxide and potentially harmful gasses, such as sulfur dioxide, carbon monoxide, from the air and release oxygen.
- One large tree can supply a day's supply of oxygen for four people.
- A healthy tree can store 13 pounds of carbon each year— for an acre of trees that equals to 2.6 tons of carbon dioxide.
- Each gallon of gasoline burned produces almost 20 pounds of carbon dioxide.
- For every 10,000 miles you drive, it takes 7 trees to remove the amount of carbon dioxide produced if your car gets 40miles per gallon (mpg); it will take 10 trees at 30 mpg; 15 trees at 20 mpg; 20 trees at 15 mpg and 25 trees at 12 mpg.
- Trees help reduce surface water runoff from storms, thus decreasing soil erosion and the accumulation of sediments in streams. They increase groundwater recharge and reduce the number of potentially harmful chemicals transported to our streams.
- An acre of trees absorbs enough carbon dioxide in a year to equal the amount produced when you drive a care 26,000 miles.
- Trees cool the air, land and water with shade and moisture thus reduce the heat-island effect of our urban communities. The temperature in urban areas is often 9 degrees warmer than in areas with heavy tree cover.
- Trees can help offset the buildup of carbon dioxide in the air and reduce the "greenhouse effect."
- Trees create microclimates suitable for growing shade loving plants.
- The American Forestry Association estimates that 100 million new trees would absorb 18 million tons of carbon dioxide and cut US air conditioning costs by $4 billion annually.
- Dews and Frosts are less under trees because less radiant heat is lost at night.
Personal and Social Benefits
- Trees are the least expensive plants you can add to your landscape when you consider the impact they create due to their size.
- A tree can add music to your life by attracting birds and other animals.
- A tree can provide pleasant smells. A cherry tree can perfume the air with 200,000 flowers.
- Hospital patients have been shown to recover from surgery more quickly when their hospital room offered a view of trees. They also had fewer complaints, fewer painkillers and left the hospital sooner.
- Most of us respond to the presence of trees beyond simply observing their beauty. We feel serene, peaceful, restful and tranquil in a grove of trees. We are "at home" there.
- Trees provide us with color, flowers, fruit interesting shapes and forms to look at.
- Trees can screen unattractive views, soften the sometimes harsh outline of masonry, metal, asphalt, steel and glass.
- Trees can separate and define space thus providing a sense of privacy, solitude and security, and create a feeling of relaxation and wellbeing.
- Trees can serve as a living legacy for the next generation— thus linking us to near and distant generations.
- Lowered electricity bills are paid by customers when power companies build fewer new facilities to meet peak demands, use reduced amounts of fossil fuel in their furnaces and need fewer measures to control air pollution.
- Trees can help direct pedestrian traffic, provide background and thus enhance the appearance of other landscape plants and our homes.
- Trees help people reflect positively on life changes.
- Trees have been reported as having a relaxing effect on students studying for exams.
- Studies have documented that urban vegetation can result in slower heartbeats, lower blood pressure and more relaxed brainwave patterns.
- Sound waves are absorbed by tree leaves and branches. A belt of trees 100 feet wide and 45 feet high can reduce highway noise by 50 percent. Prolonged exposure to noise can cause hypertension, higher cholesterol levels, irritability and aggressive behavior.
- Trees can create lasting impressions on how a community is perceived by visitors and affect the mood and community pride of its residents.
- Trees can enhance community economic stability by attracting businesses and tourists— people linger and shop longer when trees are present.
- Apartments and offices in wooded areas rent quicker and have a higher occupancy rate— workers in offices in wooded areas report more productivity and less absenteeism.
- Property values of landscaped homes are 5 to 15% higher than those of non-landscaped homes and homes are quicker to resell than homes without trees.
- Trees increase the humidity in the air, help increase groundwater recharge, reduce soil erosion and stormwater run-off thus reducing the amount of water we consume and the need for new water treatment plants and stormwater structures. A study in Salt Lake City revealed the tree canopy reduced surface runoff by 11.3 million gallons following 1 inch of rain.
- The feeling of community pride created by trees can help reduce crime.
- By reducing heating and cooling costs, trees can reduce our dependence on oil and natural gas.
- By absorbing and deflecting falling rain, trees can reduce the severity of floods.
- By reducing carbon dioxide, dust and other potentially harmful gasses in the air our air quality is improved through lower levels of ozone, carbon monoxide and sulfur dioxide.
- Trees make communities livable for people and their activities. People walk and jog more on streets with trees; children and adults have a cool place to play or relax in the summer, thus increasing their interaction with neighbors.