The Black Forest in Germany, considered by many to be a natural forest, is actually a product of human labor. Pictured: The cover of The Forest Book by Dan Hendel

The Black Forest in Germany, considered by many to be a natural forest, is actually a product of human labor. Pictured: The cover of The Forest Book by Dan Hendel

The Black Forest in Germany, considered by many to be a natural forest, is actually a product of human labor. Pictured: The cover of The Forest Book by Dan Hendel