In middle school I read a 'young adult' book - again I don't remember the name of the book or the author, and in this one, the year is more flexible, I got it from the school library in the mid-80s, which means there's a good chance it was originally published in the 60s or 70s.
In this story the protagonist is a teenager who wakes up from a coma in the future. I specifically remember the opening scene when he wakes up - there's a guy with robot eyes (it turns out the doctor had somebody throw acid in his face prior to the events of the story) and three nurses who were identical (clones) but with brightly colored hair (blue, purple etc, at a time when dying one's hair as such was a lot more novel than it is now). I can't remember what put him in the coma or why he was revived when he was (he may have simply woken up).
I recall a lot of it was about him trying to make sense of the new world he was in, and there was an ecology theme, cause the oceans were an oily yellow and lifeless (I remember one character telling him that maybe since he remembers the oceans as they were before mankind ruined them, that he'd be able to figure out a way to revive them - this seems like an insignificant detail, but I just read on the 'How to write an ident question' page that no detail is too measly), and the overall the state of society was worse than that of the one he'd left behind.
I also don't remember how this ends, although I'm pretty sure it was along the standard lines of 'hope for the future despite uncertainty'.
