William McDonough in his TED Talks presentation was explaining why the book "Cradle to cradle" is not made of trees:
To use something elegant as a tree... Imagine the design assignment — design something that makes oxygen, sequesters carbon, fixes nitrogen, distills water, accrues solar energy as fuel, makes complex sugars and food, creates microclimate, changes colors with the seasons and self-replicates... Why don't we knock that down and write on it?