Re: composite woods
What's the problem with using faster-growing trees that can be sustainably utilized for wood?
the problem is when this is done by encroaching on established forests.
tree farms i suppose are a good alternative to clear-cutting, but i would assume that growing things like hemp for their fiber to be made into wood composites yields much more material in the same amount of time. whereas it may take a tree (i dunno, im guessing) maybe 10 or 15 years to be the right size to yield enough wood, you can grow two, maybe three crops of hemp per year, probably more in temperate and tropical areas.
the problem with growing a bunch of trees and then cutting them down is, after season upon season, growing, cutting, growing, cutting... the soil becomes depleted. it isnt just a matter of adding back the nutrients... any forested area takes a VERY long time to get to a state where it can produce its own food for itself (you have to take into account insects and other tiny critters, bacteria, shrubs, vines, mosses, and EXTREMELY important, fungi).
with traditional farming, you can grow a quick growing crop, be done in less than a few months, move to a different plot and let the first plot go fallow, allowing it to regenerate (or grow a cover crop).
with trees, this just doesnt seem feasible to me.