Why is Edward work considered green literature?

It's not accurate to say that Edward's work is definitively considered "green literature." There isn't a universally agreed-upon definition of green literature, and it's more of a broad term encompassing various works with environmental themes. To understand why someone might associate Edward's work with green literature, we need more context.

Please provide me with:

* Who is "Edward"? Is this a specific author, a character, or a fictional entity?

* What is Edward's "work"? Is it a book, a poem, a painting, a film, or something else?

* What are the environmental themes, if any, that you are referring to?

With this information, I can help you understand why someone might classify Edward's work as "green literature."