The opposite of paper being a dead-tree

In this question, John Y refers to a printed version of a book as "dead-tree book". I found that amuzing and started to wonder what the opposite of such term would be.

Of course, the popular term would be "electronic book". However, I'd like to retain the style of the original wording.

Solution 1:

How about :-

"No-tree-dead book"

Solution 2:

How about a live-wire book? The e-book can't appear without electricity, and that's going to involve a live wire somewhere. (though we might need to allow a conductive trace on a circuit board to be signfied as a "wire")

The trouble with any "clever" alternative to the standard term "e-book", is that you're probably going to spend so much time explaining your alternative, that its snappiness is wasted.

Solution 3:

How about tree-friendly books, paper-free books, and save-a-tree books?