This is true, but it's been known since at least medieval times that that air pollution was pretty unhealthy; arguably a better reason to actually do something about things than climate change.
The same can be said about the usage of lead in fuel and paint; people have known it was harmful well before leaded fuel was invented.
The elephant in the room seems to me more that we, as a society, are pretty inept at long-term and "big picture" thinking and have a strong and deep bias that progress is both good and inevitable.