My apologies if this has already been discussed: In a news article online today about research into black soot impact on global warming: "The U.S. Environmental Protection Agency in mid-December also tightened limits on soot pollution from power plants, diesel engines and burning wood from levels set in 1997." Read more: http://www.smh.com.au/environment/climate-change/black-soot-impact-on-global-warming-worse-than-thought-study-20130116-2cshu.html#ixzz2I5q0OL4h Also found this: "12/17/2012 08:57 AM ShareThis Under Court Order, EPA Toughens Air Quality Standards for Soot SustainableBusiness.com News The US Environmental Protection Agency has finalized rules that reduce by 20% the maximum amount of soot emitted by factory smokestacks, power plants, diesel trucks, wood-burning stoves and other pollution sources. ...States and counties must comply with the rules by 2020, although they can apply for extensions up to 2025, depending on how hard it might be for certain areas to meet the new standards by that time." Does this news have any immediate or practical effect on current sale or design of woodstoves? Or will it just further narrow stove choices and localities where you can burn in the future?