I've been following discussions in Taylor's mag, "Wood and Steel" and it really is a little frightening .... I hope we can still find a way to produce oxygen when the trees are all gone too. Playing guitar will be the least of our worries if we can't breathe. I'm not a doomsday kind of guy, but I do think about it once in a while. I recycle way more than I used to. I think we all need to.