'Soot' as a serious cause of warming...... as much or more than greenhouse ges?

It certainly seems plausible to me. The good news is that soot is relatively short lived in the atmosphere. The bad news that China and India (especially) need to clean up their act. I have never been one to ume that humans are too insignificant to affect the climate. In fact I think we have probably emitted more CO2 than is responsible for the 100 ppmV which is the approximate increase in the last 100 years. I am simply extremely skeptical that CO2 is causing significant or hamful warming. The effects of soot is just one of many factors that are poorly understood. I wouldn't know if it is more or less and probably has wide local variation. Obviously a lot of soot is natural from fires.