Libraries buy books regularly, and they want to hear from you to so they can buy books that are relevant to their communities.
If you'd like to undertake a little quiet activism and make the world a better place for another childless person, a great place to start is asking your library to buy a book.
Most libraries take suggestions on their websites or via email.
A great place to start is to pick something you want to read. If you're stuck for ideas take a look at the lists on this site, or start with the Top 10.