Trees are a renewable resource.
Paper books require little energy to read (aside from a lamp and some cookies, perhaps.)
Browsing is easy.
can last for decades or centuries
are often lent to many readers (via libraries as well as informal passing around.)
are generally not thrown away but are donated or sold.
are a carbon sink.
are pleasant to read in bed, in the bath, on the beach, or atop Mt. Everest.
are heavy to ship.
become dated very quickly and can’t be directly updated.
are an all or nothing proposition. You either buy the whole book or none of it.
can be made from recycled materials and printed with non-toxic ink but often (usually?) are not.
Paper manufacturing requires a great deal of water and energy.
Pulp trees are often grown in an unsustainable way.
Many (most?) books are printed overseas and shipped long distances.
Because book returns are allowed, many books are shipped twice... to a bookstore, then back to the warehouse.
Excess books that are returned may ultimately never be sold and instead get recycled or destroyed.
Bookstores, libraries, and warehouses must be heated, cooled, and otherwise use energy.
Hundreds of books can be stored in one easy-to-carry package.
Various enhancements such as dictionary access, easy searching for terms, sound, animation, and who knows what else already are (or soon will be) possible.
Creative possibilities such as multiple endings, non-linear reading, internal and external linking, reader collaboration, and other multimedia mash-ups are possible.
Narrow interest publications are more economically feasible.
They can’t be read without electricity.
Reader devices (e.g. computer, Kindle) take energy to manufacture and ship, and often contain toxic or nonrenewable materials.
Device life spans are relatively short.
Current devices are expensive.
Some technologies allow the seller to delete the book from a purchaser’s device (yikes!)
Readers can’t share a book under copyright (legally, anyway) except by lending their device.
Many titles are not currently available in electronic form.
Many people just don’t like reading on a screen.
Browsing e-books is a clunky experience compared to swiftly flipping through books in a bookstore.
I haven’t reached many firm conclusions, but one thing is for sure; it’s highly desirable that both paper and e-books be as green as possible, period. The trend is for “we the people” to be more demanding about how the products we consume rate in terms of their sustainability. As authors and readers, these issues are a top priority for us to think about now and in the years to come.