Well, I hate to break it to you, you guardians of books that have a mania for keeping them in perfect, new condition, but all your books are on fire. That's right, they're on fire. The fact that you don't see flames shooting out of them only means that they are burning very slowly - they are oxidizing. The paper is reacting with the oxygen in the air, much like iron reacts with water and oxygen, and rusts. See the pages turning yellow and then brown over the years? Sunlight hastens the job.
Now, if you keep your books in the dark, and in a sealed container, pressurized with an inert gas, you will prevent the oxidation process. Of course, that will make them so much harder to read. And even so, you will only extend their lives by several centuries at the most. Perhaps half a millennium. Now, if you really want to preserve a paper document indefinitely, you must photograph it and render it in microfilm. Digital scanning won't do the job -as archivists know, only microfilm can be depended on for really long term storage, because any digital documents need a functioning reader with the appropriate imaging software to open the digital files in the format they are stored in. As fast as software is changing, your digital files may not be readable in 10 years, much less 1000.
Don't mind me, just ranting.