This is in no way a suggestion; I'm just curious. Please read on. A friend of mine has a house that is heated by burning wood. I won't give his entire story, but he did include that burning wood for heat is significantly cheaper than burning natural gas, which makes it way way cheaper than electric heating (electric is the most expensive). This would imply that there is either a huge surplus of trees in North America, or there is a shortage of coal (not bloody likely). Anyway, could burning trees actually be used to generate heat and power on a large scale? I don't mean power the entire country the way coal does, but what about small towns or areas that are somewhat isolated from other sources of energy? Thoughts?