To recap the link I posted, this is the important part:
http://plancksconstant.org/blog1/2007/01/liberals_cannot_see.html
"This means that for every 100 trees in an area defined as a forest, the non-forest areas add another 43 trees. Add that to the trees in the 60% forests and we are up to 85% of the number of trees we had 400 years ago.
Now while it is true that in earlier centuries the lumber industry raped our timberlands, they changed their method of operations over a century ago to managed plantations for their timber needs. In addition, these plantations produce timber at 5 to 10 times the average forest yield. What this means is that we need only one-fifth to one-tenth of previous forest space to have the same number of trees for timber. The plantations produce the same number of trees as do 20% of our forests. For those with a pencil, for every 100 trees in a forest there are 20 plantation trees; bringing our total tree count to 105%; that is, even with 40% fewer forests we have 105% of the trees we had 400 years ago."
And here is what this guy thinks:
http://www.newton.dep.anl.gov/askasci/bot00/bot00090.htm
I don't know how this could be determined, since there is no real way of
knowing exactly what forests looked like at any given time that far back in
history. Its likely that there are more trees in some places, like on the
great plains, where they have been widely planted around towns and home
sites; on the other hand much of what was forested land in the eastern U.S.
has been converted to agriculture and urban. Certainly there are more trees
now than in 1900, at the end of the great timber baron era of deforestation,
and especially since the 1930's depression years much marginal farmland has
been turned back to forest - but much of that was probably forested
originally anyway so its hard to say whether there has been any net gain.
And what exactly is meant by "more trees?" If you really mean the total
number of individual trees then this is probably a true statement since
virgin forests had relatively few large trees per acre, and have been
replaced by young forests with more but smaller trees per acre. But if you
mean total forested land I think it is a very debatable proposition.
I agree with the above. It is debatable, but is no way an established fact or provable that there are less trees now. In fact, I think the preponderance of evidence points the other way.
Another site:
http://www.madsci.org/posts/archives/2002-04/1018741400.Bt.r.html
And this site shows that just forests have improved markedly in the last 100 years, and this does not count the billions of trees planted that are not in forest areas:
http://www.forestlandowners.com/press/new-u-s-forest-service-data-reveals-positive-gains
Perhaps my perception is skewed slightly by the region I know best. My grandfather homesteaded a farm and personally said there were only 4 or 5 trees there in 1893, a couple threee along a creek, plus a couple oak trees on the prairie. And this was the way it was a very long time before he got there. There are now a couple thousand trees or more, probably, just on that farm alone. The same would be approximately true for up to a couple hundred miles or so in some directions from this locale. Call it anecdotal evidence if you want, but I call it reality, and I have traveled extensively in the region, and have talked to many people. I have personally witnessed it myself for over 50 years. And I have good reason to believe the phenomena I have observed is present in many many states, actually in almost a majority of states most likely to some degree or another.
Truth is there is probably no conclusive study that proves it one way or the other, but there are lots of reasons to believe my assertion and that you have no proof to the contrary. You certainly have been shown to be out of bounds for accusing me of really losing it. I think you are like most people, you have been fed a line, and you have bought it hook line and sinker without any healthy skepticism. There are lots of myths surrounding the enviro movement, and I think this is one of them.
Again, I am only pointing out U.S. only. If I have time, I may look into the world situation, but frankly I think that is another probable myth as to the seriousness of the problem of deforestation.