No. They knew about CC. in the 50's - their own engineers pointed out the problem and the dire repercussions it would have. Admittedly, those engineers had only

No. They knew about CC. in the 50's - their own engineers pointed out the problem and the dire repercussions it would have. Admittedly, those engineers had only just realized what physicists had known since the late 19th century. No matter how you slice it, as you point out, they've known about the problem, they've lied about the problem, they've spent millions of dollars in a public deception campaign - and they've been doing it for decades. Heck, we're still getting to the bottom of all the damage brought on by their adding tetraethyl lead to their gasoline. It's going to take even longer sorting out through all this mess. They'd just like us to forget about it and move along. That's not gonna happen.