As oil supplies dwindle and environmentalists and homeowners alike are becoming more and more aware of the need for new sustainable heating options, wood is re-entering the picture as a feasible renewable fuel alternative. But many wonder how clean and renewable it really is. Wood heating has evolved greatly from the days of wood cooking stoves and fireplaces as major heating sources. New gasification technology has made wood heating environmentally friendly by eliminating 90% of emissions released by conventional wood burning appliances. But with new technology and standards emerging constantly in the field, it is hard to make the right choices for yourself and for the environment.