I am not an educated or very smart person but I do remember burning coal in the fireplace and/or furnace and fuel oil in a space heater. It all added to the dirty atmosphere and contributed to fouling the air as did the unfiltered smokestacks of the foundaries and tanneries and the trains that burned coal and wood. During my lifetime, there has been regulated cleanup of air quality and filtering of those smokestacks. I dont think global warming is manmade but a natural part of the chain of events in the passage of time.
My lawn and flowers are burning up here in the deep swamp but I dont blame man for that. It is due to the lack of rain and intense heat and lack of cloud cover.