Theodore Roosevelt when he became President, decided to set an example on forest conservation by NOT having a Christmas Tree. He had pre-teen and teen age children and all of them wanted a tree. At this point the story diverge. Story "A" goes that the kids smuggled in a tree and when TR found out about it and then walked the kids over to his head of the Forest Service, Pinchot. Story "B" had the kids going to Pinchot directly and taking him to TR. Either way TR was in the presence of his head of the Forest Service saying he wanted to conserve the Forest by NOT having a Christmas Tree and wanted Pinchot to tell his kids why it was important to save trees.
Now Pinchot had traveled the world studying other countries Forest Conservation. He wanted to buy land for Federal Forests so he could better balance not only how the trees were harvested, but also restored. He wanted to cut out clear-cutting and reduce the harm such cutting did even on private lands, but the Chief program while head of the Forest Service was buying land and putting it under Federal Control (more to should private owners how to better manage their own lands but also to do a better job of maintaining forests for future use). While Pinchot first aim was tree used for woods (Mostly on Federal Land) he also wanted to improve how forests and trees on Private land were handed. The later was harder for he could NOT order how private owners could sue their land, but he could developed programs that better the balance between the environment and the needs of the private land owners. The Christmas Tree was the heart of that program.
At that point Pinchot told TR, that saving trees while important is less important than saving FORESTS. Furthermore FOrests are more than trees AND trees serve more purposes than where we get wood from. Water conservation is tied in with trees, pollution reduction is tied in with trees. Furthermore you have to understand how Forests and man interact. All told NOT cutting down a tree may not save a forest, for the tree may than be cut down and just thrown away and the land converted to open field, for such farmland or Pasture land is more valuable to the owner than to leave trees he can not sell grow on that land. On the other hand if that landowner has a REASON to plant trees, he will plant trees and you get many of the same advantages as a true forest. One of the quickest turn-over trees are Evergreens grown as Christmas Trees. This provides a good return on the land AND also provides stability of Trees on the land, but this only happens if there is a market for Christmas Trees. If no one buys Christmas Trees most of the land the trees will grow on will be converted to Farmland or pasture, with the lost of bio-diversity which incur during such conversion.
The only way to prevent this is to encourage Landowners to plant Christmas Trees on marginal land. The best way to encourage such planting is to buy a Christmas Tree. Thus Pinchot told TR the best way he could help the Forests of America was to buy a Christmas Tree. TR respected Pinchot and took his advice and the White House has had a Christmas Tree ever since.
Pinchot:
http://www.dep.state.pa.us/dep/PA_Env-Her/pinchot_bio.htmhttp://www.lib.duke.edu/forest/Research/usfscoll/people/Pinchot/Pinchot.htmlTR and the Christmas Tree:
http://www.hymnsandcarolsofchristmas.com/O_Tannenbaum/12b-The_White_House_Christmas_Trees.htmhttp://partners.nytimes.com/books/98/12/20/reviews/981220.rv021431.htmlOther Christmas Tree Sites:
http://agweb.okstate.edu/fourh/aitc/lessons/extras/facts/cmastree.html