They were publishing and discussing these things in the 70’s. Not big oil secret memos - published articles, tv shows, magazines, all that media could carry had it consistently represented over fifty years ago all the way through to today.
Tree huggers. Disgusting hippies. Loonies. That’s all the thanks these people could muster. Yeah, some people are not going to accept a “whoopsie. Gosh i was wrong” and just forget it. With good reason.