The burning of wood is a major source of black carbon the world over.
Climate Change: Soot's Role Underestimated, Says Study -- BBC
Black carbon, or soot, is making a much larger contribution to global warming than previously recognised, according to research.
Scientists say that particles from diesel engines and wood burning could be having twice as much warming effect as assessed in past estimates.
They say it ranks second only to carbon dioxide as the most important climate-warming agent. The research is in the Journal of Geophysical Research-Atmospheres.
Black carbon aerosols have been known to warm the atmosphere for many years by absorbing sunlight. They also speed the melting of ice and snow.
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My Comment: Outlawing and/or limiting fireplaces is not going to make much headway .... especially for those who live in cold climates.