Monoculture in forestry is a bad idea—the Gearraidh na h-Aibhne plantation of western hemlock on the Isle of Lewis was completely destroyed by the pine beauty moth.Forestry must be planted with markets in mind, whether we are talking about the production of fuel briquettes for biomass, which Jim Hume mentioned, or the production of high-quality paper, for which Scotland already has a good reputation: Time magazine...