If he's serious at all. Most likely he realizes that he can derail or bog down ANY discussion of warming by introducing his posts opposing "warming mitigation" and suggesting that since there's supposedly no "experimental evidence supporting mitigation" that therefore the whole thing's a "hoax."<quoted text>
So you're basically saying that because we can't find mitigation efforts that work, then why even try? Based in what you just said, unless it's proven 100% before attempting mitigation, then such activities are a no-go. Right? Wrong, recognize there is a problem, take real-word measurements that define it, and then attempt mitigation, rinse and repeat.
I once thought he was serious and just obsessive, but I've come to believe he's a troll who does this deliberately. It's such a pervasive pattern with him.