Not really but seeing as you mention it: wood is a solar fuel, not a fossil fuel, and it is carbon- neutral, not carbon- positive like fossil fuels. The normal cycle for trees is that they grow, die and rot, with seedlings repeating the cycle ad nauseum. Carbon- neutral. If you burn the same wood, you are merely speeding the cycle, not changing what would normally or naturally happen. This assumes the wood is burned cleanly, without particulate emissions (smoke). This is quite different from, say, burning coal, which was happily sitting in the ground as carbon. When we dig it up and burn it, we make a pile (technical term) of carbon dioxide that would have never been formed naturally.
And now for the trivia question: What is the 'greenest' car you can own? The one you already own. Buying a new, more efficient car causes a tremendous amount of greenhouse gasses to be generated before you ever take possession of it. Better to be less efficient per mile and NOT cause the new car to be built at all. :-)
Brian
Aren't you just a little concerned about your carbon footprint? Remember the mammoth.