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UV can damage plastic. Takes a while, and plasma TVs I hear don't last more than 3 years or so.
(my old tube TV mitsubishi is from 1994, 14 years and still runnning or I'd go get a plasma)
glass will block some of it.
Modern plasmas have far less ghosts from slight burn-in than those a few years older.
Even the ghosts on those older sets from e.g. watching snooker all night long go away after a day or two of playing other images (but again: modern plasmas do not have that problem anymore -or at least far less-)
half-life of plasma screens (time they are on before the intensity of the light they produce reduced to half the original intensity) of plasma screens differs a lot between manufacturers (just like any old CRT tube). I've not seen filtered sunlight being a factor in that life-time (but it might well be). Even then as long as it's all the screen all you need to do (just like with an old CRT) is to increase the brightness of the screen (there are limits of course).