Comment by bluGill

There are certainly more trees where I lived than there were a hundred years ago, but there are also more trees than there would have been a thousand years ago. I live in an area that should be natural prairie and humans have planted a lot more trees than the ecosystem would support in a natural situation.

I don't know if this is good or bad from an environment situation, but it is a part of a reason I am suspicious of claims that more trees are good.