It is not easy to describe my feelings about this except to say I won't forget it, I wouldn't want to have been in the time and place and the direction/editing is a bit different from the norm.
It is a made for cable production but it is adequate for the short running time. Although the screenplay consists mainly of an interaction between two characters the writing is fine and the performances are in the hands of two fine actors.
As an environment killer, it should only rate* but in the 60's Jack probably didn't realise he was an environment killer so will give him the benefit of the doubt. There is plenty of archival film & as not all is about going round in circles it helps.