In direct response to you, I'll thank to keep personally offending comments to yourself.  Any ecologist in Australia knows what I am saying about introduced species is spot on.  I used the term "semantic" in the sense of arguments on intricacies of meaning that serve no useful purpose in the educational, definitional or any other sense.  I think most of the recent discussion fits this unfortunate description.  Bottom line is, humans introducing species is a dangerous game, it threatens global biodiversity, and there is enough environmental devestation outside of Europe and the US caused by introduced species for generalised claims of lack of impact or ambivalent "encyclopedia" articles to be clearly inappropriate.