i disagree with your findings
i disagree with your findings on diesel. there was a time when diesels put out a soot mthat went to the ground and didnt cause airborne pollutants. there was also a time when diesel oil was a waste product of refraction. similar to flouride another waste product, wait we put that on our teeth. anyway, there is a lot of developement that reduces diesel's usefulness, then again coal powder was the original fuel for the diesel engine until mr diesel was killed.