No need to eradicate or, worse, a poor cut fir to decorate our homes at Christmas. An example? One inspiring tree is that of the Gleeson Library in San Francisco, made from stacks of a bunch of their own books. A group of boys of the Gleeson Library has created this original tree simply by stacking the precise proportions of the books, taken from the shelves of the library from which are bound in green. Few stars of paper here and there, some doll and the inevitable Christmas star on top of a tree and that's environmentally friendly and no expensive. Plus, at the end of the season, the books can just be unstacked and put right back on the shelves.