Landscaping with trees
A large front yard tree can provide the following benefits each year
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Saves $29 in summertime air conditioning by shading the building and cooling the air (250 kWh),
about 9% of a typical residential building's total annual air conditioning cost.
(This finding assumes tree is west of the residence where it provides maximum shading benefit.)
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Absorbs 10 lbs. of air pollutants, including 4 lbs. of ozone and 3 lbs. of particulates.
The value of pollutant uptake by the tree is $45 using the local market price of emission reduction
credits. Uptake of Nitrous Oxide (NOx)by the tree (1.07 lb) is equivalent to NOx emitted by a typical car driven 188 miles. (NOx emissions
taken from a Sacramento Bee article, Dec. 7, 1997, Forum 2, that lists EPA test results of measured emissions
at 4,000 miles, as well as maximum emissions allowed at 50,000 miles for 7 car models and 11 models of light trucks. This
calculation assumes 30 grams/yr. uptake by tree and car emission rate of 0.16 grams/mile for Ford
Taurus at 4,000 miles. Emission rates ranged from 0.06-0.16 for the cars listed.)
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Intercepts 760 gal of rainfall in its crown, thereby reducing runoff of polluted stormwater and
flooding. This benefit is valued at $6 based on local expenditures for water quality management
and flood control. (Interception is relatively low for this deciduous species in a climate
with predominately winter precipitation. An evergreen camphor tree is coastal Southern California
was estimated to intercept 4,000 gals annually)
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Cleans 330 lbs. of Carbon Dioxide (CO2) from the atmosphere through direct sequestration in the tree's
wood and reduced power plant emissions due to cooling energy savings.
The value of this benefit is $5 assuming the California Energy Commission's price of $30/ton. This
tree reduces the same
amount of atmospheric CO2 as released by a typical car driven 388 miles. (From the same Sacramento
Bee article, Dec. 7, 1997, Forum 2, CO2 per year assuming 15,000 miles driven a year (55% city,
45% highway). Assuming an average
emission rate of 0.85 lb/mile, the CO2 offset by the tree is equivalent to 388 miles driven. Emission
rates ranged from
9,200-14,800 lb/yr. for the cars listed.)
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Adds about 1% to the sales price of the property, or about $25 each year when annualized over a 40-year period. This assumes a median residential property sales price of $100,000.
(Based on research that found a large front yard tree increased the sales price of residential
properties by nearly 1%: Anderson, L.M. and Cordell, H.K., 1988. “Residential Property Values
Improve by Landscaping with Trees.” Southern Journal of Applied Forestry, 9:162-166.)
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