How is that not better than using oil and toxic chemicals to use in equipment that cuts down and processes those trees, and how about the printing process for the books?

How do you think they manufacture electronics? Trust me lots of chemicals. Then when you are finished how often do you recycle your electronics devices? I know I don't ever unless it one of those cell phone recycle bins.

Google is using green energy for their server farms btw. And in the long run, if you ever need to replace a book. You can do so without any additional waste, unlike a hard copy book.

Google is (as far as I know) only running a few green server farms. One in Oregon and the other in Finland. And even these farms are only getting partial power from hydro electric sources. The rest run on regular old energy sources (as far as we know, Google doesn't like to comment much unless on them to keep them safe.) Computers can run on green power all they want. But there are many chemicals used in their production.

Paper books and e-reader both have up sides and down sides.