I know that you'll be happy to hear that even though trees die to make books, I have talked to my Mango Publishing people about paper options which are recycled or partly recycled.
Of course, the e-books will eliminate the need for paper altogether, but every small effort to make a smaller ecological footprint helps. Greta Thunberg is right about one thing. If everyone does something, no matter how small, it makes a difference over all.
Do something. Make a difference. Even a small one.