Re: thread hijack facts
1) Pinyon pine are really slow growers, 100yrs is a young'n. Record living single-needle pine is 1250 years old. Most trees in size classes targeted by woodcutting are 200+. 500+ age classes exist in most local populations.
2) There are a gad-zillion of them in the Great Basin, and they propagate like bunnies on the 100 year timescale. They are useful and very renewable (1880's gov't botanist predicted their extinction at the hands of the charcoal producers).
3) Present-day pinyon expansion (read: increased stand density and upper/lower elevation advance) is mostly driven by a post ~1850 warmup in the region, with confounding factors including removal of nut-harvesting natives, 1865-1930s mining-related clearcutting, grazing disturbances, cheatgrass introduction, and fire ignition/fighting activities by people.
4) Previous climatic response of the species is unknown (for instance, previous warm and cool periods), not enough fine-scale evidence. Pre-settlement stand densities and small-tree upper and lower elevation density all not easily quantifiable with available data.
5) The current BLM agenda of finding expensive (contractors) and high-disturbance (high-percentage soil area contact) methods of cutting down pinyon is driven by large amounts of tax dollars shunted towards preservation of a non-endangered game bird, the sage grouse. Many examples of landscape-scale pinyon removal gardening experiments in Nevada by the BLM and USFS are not even located in decent sage grouse habitat. Previous (pre-1990's) pinyon removal efforts were done supposedly to create better graze areas, but that fell out of vogue as the land management agencies finished morphing into special-interest conservation tools.
So yeah, pinyon pine are cool, ubiquitous in their range, not going anywhere in the long run, and a great excuse to spend tax dollars on activities that would land a rancher in prison.