This is a really interesting question thumbi7, and I'm not sure if it's possible to give you an exact answer. So I goggled your question, and it led me to this web site - http://answers.yahoo.com/question/index … 018AAscGOo I hopes this helps you in some roundabout way!
Each year a healthy tree can absorb around thirteen pounds of co2. An acre of trees can absorb 2.6 tons of co2. It helps to put this in perspective if you know that each person in the U.S. produces 2.3 tons of co2 each year.