The US Department of Energy has a great worksheet that can be used to determine how much carbon a particular species of tree can absorb based on several factors. The worksheet can be downloaded here: http://www.wildflower.org/expert/show.php?id=1634
As an example, a 1 year old fast growing hardwood can sequester 4 lbs of carbon per year while the same tree in 50 years would sequester 122 lbs per year.
The amount varies on the species, age, and location of the tree. A larger tree absorbs much more carbon than a younger tree. In one year, the average person emits 26 tonnes of carbon a year. A 25 year old maple tree absorbs s 1.1kg or 0.0011 tonnes of CO2 a year. To offset one tonne of CO2, you would need 36 maple trees over the next 25 years. Whereas, a 25 year old pine tree absorbs 6.82kg or 0.00682 tonnes of CO2 per year. To absorb one tonne of CO2, you would only need 6 pine trees over the next 25 years.
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