It's the fault of the Forrest service because they've stopped logging. That means that more trees have been allowed to fall on the forest floor and breed more of these things.
I also think that pollution controls have something to do with it. The old "dirty" smog actually was an airborne fertilizer, allowing the trees to fend off the beetles. Now that cars run cleaner, the forests are going to die back down to what they were in previous centuries.
Environmentalists are idiots.
You got those beetles and here in S.E. Michigan we got the Emerald Ash borer. My subdivision had all its Ash trees cut down last fall and on my drive to work in Troy, Michigan, the devastation caused by the borer is becoming more and more evident every day. I first noticed what was going on about 2 months ago when all the trees along my drive on Coolidge Hwy. lost their leaves then I woke up and realized they were ash trees. The city is now in the process of cutting all of them down. Literally every neighborhood in that area has giant ash trees that are now devoid of foliage and for the trees on private property the removal is the responsibility of the homeowner.
Next spring the destruction is really going to be noticible when all the existing dying ash trees will not last the winter and no leaves will appear. What a mess!
I forgot to mention that the Upper Peninsula now has documented cases of the borer. Most likely due to stupid people who chose to make firewood out of their infected ash trees and transport it up to their cottages. All the warnings issued by the state prohibited the transportation of any and all ash trees ..........