Many schools in the U.S. and abroad do not the enough money to acquire textbooks for all of their students. Other, higher income, schools replace textbooks every few years. Old textbooks must be stored or disposed of, which is a drain on budgets. Taking the used books and distributing them to low income schools saves money, and more importantly, increases children's access to textbooks. This simple step can help them become more educated and rise above poverty. Additionally, this will keep textbooks from ending up in landfills, where the knowledge contained simply decomposes. 

Some schools already donate textbooks when they no longer need them. Unfortunately, many do not. Reduce, Reuse, Restudy takes the responsibility away from individual schools, removing the barriers to textbook donation. 

Schools often replace textbooks when they are still valid. Take a physics textbook for example. How much actually changes in 5 years? Newton's laws are still the same. How about biology? Chemistry? The basics in the sciences rarely change. History? The few years that have passed since the book was published generally aren't covered in primary or secondary school. The knowledge is still good. Let us make use of it.