edthecynic
Censored for Cynicism
- Oct 20, 2008
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A 1 inch diameter tree will not sequester 48 lbs of CO2 per year!!!!! So like always your numbers are whacked!Now this may seem rather simple but please follow these numbers and tell me where I'm wrong...
Carbon sequestration, air quality, and climate change
- A tree can absorb as much as 48 pounds of carbon dioxide per year, and can sequester one ton of carbon dioxide by the time it reaches 40 years old.
- One large tree can provide a supply of oxygen for two people.
- Tree Facts American Forests
In 2011, utility coal plants in the United States emitted a total of 1.7 billion tons of CO2.
A typical coal plant generates 3.5 million tons of CO2 per year.
coal power air pollution Union of Concerned Scientists
According to the last forest inventory, there are almost 247 billion trees over 1 inch in diameter in the U.S. Tree Facts Facts About Trees
So according to my figures... 40,800,000 trees can absorb ALL the 1.7 billion tons of CO2 emitted each year by all the coal fired utility plants.
That means 0.01% of all the TREES in USA are absorbing the 1.7 billion tons of CO2 emitted each year.
What is wrong with these figures then?
Here are some real numbers:
Carbon Sequestration - Office of Sustainability
Tree density varies, and we used an average of 700 trees per acre (this number was taken from DOE’s "Sector-Specific Issues and Reporting Methodologies Supporting the General Guidelines for the Voluntary Reporting of Greenhouse Gases under Sections 1605(b) of the Energy Policy Act of 1992")
25 year old forest: 1,760 lbs of CO2 per acre per year / 700 trees =average of 2.52 lbs of CO2 per tree per year (rounded to 3 lbs)
120 year old forest: 3,909 lbs of CO2 per year per acre =
average of 5.58 lbs of CO2 per tree per year
Northeast, white and red pine forests
25 year old forest: 67,000 lbs of carbon / 25 = 2,680 lbs of C per acre per year x 44/12 = 9,826 lbs of CO2 per acre per year / 700 =
average of 14 lbs of CO2 per year per tree (rounded to 15 lbs)
120 year old forest: 246,000 lbs of carbon / 120 = 2,050 lbs of C per acre per year x 44/12 = 7,516 lbs of CO2 per acre per year / 700 =
average of 11.7 lbs of CO2 per year per tree .