Yeah, things slowly changing, but the biggest problem we have right now is the spruce worm. It's killing a lot of pines. The problem is all over NA. There used to be lots of elms, and birch, but disease wiped them out (mostly out) back in the 80's. S trees won't survive here yet, but if we survive until the end of the century, and trends do continue to warm things up enough, new S species will take root eventually. Aspen (Poplar dominate) around here thrive just fine. They clone themselves through the root system. they are like a weed. If you want another specie in an area that has been cleared, you have to kill them first before planting. They are really hardy, and it will take a lot to see them disappear.