How much do YOU think a tree is worth?? And how does one measure the value and then convert the result to monetary terms? Here's one way..... When Sue Rostas, Communications Officer for the Kooragang Wetland Rehabilitation Project, received a letter from Carrington Public school student, Michael Wilson, it set her thinking. Michael asked what was the economic value of a tree. He suggested we assume a value of $1 a day for the amount of oxygen that a tree produces. A tree thus produces $365 worth of oxygen per year or a total of $36,500 over 100 years (and that's not allowing for inflation!) Sue wondered how close to the mark was this assumed dollar value. A few phone calls to Assoc. Prof. Tlna Offler, University of Newcastle, and Bill Nethery, State Forests of NSW, plus some library work revealed some startling but often overlooked facts about the true value of trees. Michael's assumption had in fact greatly underestimated the value of trees. The true value (considering on...