Classrooms rely on paper for everything from worksheets, to textbooks, to standardized tests. Teachers hand out hundreds of papers a week, and students throw away dozens.

Day by day, schools tend to use up excessive amounts of paper. Most of the time it ends up back in the bottom of a trash can or for those who are a bit more considerate, a recycling bin. One sheet could mean nothing, but for a tree it's quite a big deal.