If you really think about it, reading kills trees. All the homes for squirrels and other animals that need trees just for the entertainment of humans. I don't get why people need to kill trees to be entertained, yes i know i hear it all the time "BUT ITS FOR EDUCATION". Well guess what earth killers, HOW ABOUT USE A ROCK OR SOMETHING OR THE DIRT OR PLASTIC. At least plant some trees. We all need trees and everything needs trees but trees don't need you so leave them alone and let nature be.