So it looks, to me, like Canaanites (and, therefore, IsraELites) broke from Philistine culture both in the practices of circumcision and eating meat (particularly pork). I would wonder if the environmental iron age break came from disease/illness from pork, and other unclean (or thought to be unclean) hygiene, rather than degradation of the environment due to mining/forging iron? Since the Canaanite practices seemed to promote health they were adopted and became religious laws. That would also likely promote a bigoted view of Philistines as a dirty people. 7% pig bones would indicate, to me, that some Northern IsraELites figured out to cook the pig meat at certain temp's, or preparational time, for stopping the illness. Others, scared of becoming sick, would not.
Just some added thoughts.