Stan, it could also be argued the pine beetles are rampant because of mans insistance that we not allow forest fires too.
some years ago a report was issued to that effect, forests have lifespans, and fires are natures way of self cleaning
after a fire the ground is made more fertile, the heat aids in popping open the pine cones so more seedlings get a start
and there is more dead wood lying around for critters like the beetles to dine on without resorting to healthy tree's.
also after a fire there is less of the beetles as well.
also it has been reported the planet is now most assuredly cooling, the arctic conveyor has restarted with a vengeance as well.
i wonder if man will get credit for restarting it?
somehow i doubt it, man just gets the blame never the credit.
mother nature has her ways of thinning the herd, beit hurricanes, floods, famine, or whatever
man is just along for the ride, either adapt, move or perish
same as it has always been
bob g