To educate children, Argentina's Pequeno Editor published a biodegradable book embedded with jacaranda seeds that can literally be planted after it is read.

From Publishing Perspectives:

"As an article in the Express Tribune said: “Imagine sitting under the glaring sun reading a book without a tree for shade. According to Green Peace, every two seconds, an area of forest the size of a football pitch is lost due to logging or destructive practices.”
Now one publishing company is trying to give something back.
Argentina’s Pequeno Editor, as part of a project called Tree Book Tree, has created a hand-stitched children’s book entitled Mi Papa Estuvo en la Selva, or My Dad Was in the Jungle. It’s made from acid-free paper; ecological ink and jacaranda seeds.
And the best part? There are actual tree seeds placed in every page. So after they’re finished with the book, kids can plant the book in soil and it will grow into a tree."
Read more here.