The Pine Beetle is such a disaster. Throughout the country there are vast swathes of pine trees that are brown.  Whole mountainsides a grace yard for the magnificent forest giants.  The pine beetle is actually native to the west coast. It killed one or two trees here or there but never half the country.  Global warming is what caused the beetle to become so out of hand.  It is devastating to the ecosystem when all of the trees die within a year.

The pine beetle is just another in a long line of species that have been altered to to humans.  Usually it is the invasives that cause the most damage.  Unfortunately even native species can be demolish an ecosystem.  Unless we as a race are able to reverse the trend of the global warming and ecosystem alteration, then a pine tree might become a rare sight.

http://ngm.nationalgeographic.com/2015/04/pine-beetles/rosner-text