Work with libraries to accept recyclable printed books from patrons. Give the patrons Kindle copies of the same books for nominal fees such as $1 each.
Why is this important?
My home and storage room are weighed down with printed books that take space and generate dust. With modern technology, it makes sense to have most of these books in electronic format. However, it doesn't make economic sense to pay full price for electronic copies of books that we've already purchased in print format.