I am no expert but have done a bit of reading on fire places and I am not sure we sometimes really understand the big pictures on heating our homes with Gas vs wood.
Gas produces more green house gases then the wood does regardless of stove type. In Utah and big cities it is the visible air quality that get the focus. So they try to limit the particulates in the air. I realise the wood burners are higher in this and the particles are small enough to lodge in the lung.
Wood by far is much cheaper then gas to heat with in my area but most are to lazy to chop and carry. So gas convince, along with the odorless by products and cheaper install price wins most over to gas.
In Quebec Canada Renaissance Fireplaces has revamped the fireplace known as the Rumford to create an ultra low emission fireplace. It to my understanding exceeds gas ones. The cost is high around 15,000 cdn and that was 5 years ago when I was looking at fireplaces. But could devices like this be the better solution to smog ridden cities and a huge reduction in green house gas. My only concern is could we realistically produce enough wood to heat home while maintaining our paper and lumber industries.
Here is a link to the manufacture;
Rumford revamped
Alien before condemning us dinosaurs truly look at this unit might save the environment and your pocket book. After all a new Trane furnace is as much or more then this unit. Why not put this under your heat exchanger and ponder how much it might still be made.