The cause of most fading is the ultra violet light in sunlight and not all glass blocks UV...
Yes, I've heard that. Another thing which occurred to me is the acid content of the paper, although I gather that only applies to older paper items, and not necessarily all paper types. And since I'm on a roll, there may be a question of ink permanence. I don't know if there's anything one can do about that.
The fading you refer to is UV fading of the ink -- ink permanence isn't a separate issue.
The advise to put UV-blocking film on windows is a good one. Direct sunlight is the #1 source of UV in this context.
The #2 source is fluorescent lighting. Five approaches to address this:
1. Buy tubes with a UV-blocking wrap;
2. Install UV-blocking sleeves over normal tubes;
3. Put UV-blocking film over the plastic lens of the fluorescent fixture (assuming you have enclosed fixtures);
4. Replace the plastic lens with one that blocks UV (same assumption); or
5. Switch to either incandescent or (preferably) LED lighting.
Of these, putting UV film on the fixture lens is the least expensive and most likely to survive routine maintenance (and routine maintenance staff). LED lighting is best, but also the most expensive.
I have not been able to get UV statistics for compact fluorescents (CF bulbs). Instinct suggests they're just as bad as fluorescent tubes, but the few specs I've been able to get my hands on suggests not.
Or, you could try my way ... I laminated my DL & WDW RR posters and applied a UV-blocking lacquer over the top.