Student or Learner
Nor are the dangers entirely to the rainforests themselves. Until very recently, so-called "lost" tribes - indigenous peoples who have had no contact with the outside world - still existed deep within certain rainforests. It is now unlikely that there are any more truly lost tribes. Contact with the modern world inevitably brings with it exploitation, loss of traditional culture, and, in an alarming number of instances, complete obliteration.
Can this be paraphrased like this? Does "nor" mean "not+either"?
Nor are the dangers entirely to the rainforests themselves.
=> The dangers aren't entirely to the rainforests themselves., either
Yes, that's right.