It's been a while, so I may not be remembering everything correctly. Wood burning stoves emit significant amounts of particulate matter most of which is carcinogenic (Polycyclic Aromatic Hydrocarbons which are cancer producing). Our study and analysis didn't compare it to natural disasters and acts of God like forest fires. One could argue that forest fires and volcanic eruptions spew more CO_2 than all the wood burning stoves. Possible. Forest fires are also being aggravated by climate change (hot winds fanning the flames) and human error (poor camping practices and negligence on part of utility companies). Recent wildfires in CA could be a case in point.
Our study was to just quantify emissions from winter appliances. We proposed catalytic converters and gas assisted burners to significantly cut down emissions. Cities like Fairbanks have some of the worst breathable air due to PM emissions. Our test and analysis was in Crested Butte, CO.
We concluded that human intervention, like wood burning, is accelerating climate change (by adding to natural phenomena) more than what it used to be in the past (I think we used about 50 years of data prior to 1995 for our analysis). Of course, one could challenge that conclusion. Peace in Christ.