Trees grow so fast on our land that we can't keep it cleared. We wear out our chain-saw clearing land. We can't burn the wood fast enough to keep up, and sometimes we just let it decompose where it falls, which seems a waste, but it feeds little animals. Trees grow back; the Allegheny Mountains do not. As Monty Python would say, the picture at the right is an ex-mountain; it has ceased to be. However, this is not funny.