I hear statements like this and I think about the Y2K problem. So many developers crunched ridiculous hours to fix all the bugs that were very real and would have had very real consequences. Miraculously, they managed to fix most of the severe issues so the world didn't suffer any serious damages. The aftermath was unbearable though, with all the "skeptics" gloating as they felt vindicated. "See, it was all a big hoax!" It wasn't, of course, but those people will never know otherwise.

Now, the annoying part here is that this is the best case scenario for the climate as well. If mankind does in fact manage to turn around this massive force, people like you will simply be gloating and claiming that there was nothing to worry about in the first place.