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Many real book publishers now use environmentally friendly inks and the paper is recycled, unfortunately not all books are made in this sustainable way, probably not even 10%. The costs to the publisher's would probably be too much to sustain there expected (outrageous) profit margins.
Is an ebook so much better really, well it cost the publisher maybe $1 to publish, they then charge you almost the same price as a real book and you read this nonbook (ebook) on a device put together by children in China under terrible work conditions, that device was shipped to you using up carbon energy fuel or gas, and the device must be charged up again and again...more carbon energy fuel or gas,and when the guaranty runs out or the next model comes around....trade in. just so you can read a book or magazine which 50 years from now could still be read by someone, will your nonbook (ebook)?