Lol
Thanks for the comment.
This information is actually 100% true. ~85% of the Tree's fresh mass is water, whiel the remainign 15% is dry weight. Of that dry weight ~96% comes straight from atmospheric CO2. This CO2 is fixed in a process called the Calvin cycle (which uses the products of light-driven reactions) to fix the CO2 into small sugars which are then used to make the cellulose molecules in the plant's cell walls.
I made the graph to use in my own lectures for an organismal Biology class( Big Botany component right now), and thought the fun factoid would be nice to share.
=)