What if, after the debate, Ken Ham had walked to the parking lot of his museum and discovered that the driver-side front fender of his car was damaged, with debris from his front driver-side headlight strewn on the ground? He would no doubt conclude that someone hit his car while he was parked there. But not so fast, Mr. Ham. Let's apply your own standards of evidence: You don't know. You weren't there.
Did the damage to the fender happen billions of years ago with no human living today being a witness? Never mind that with cctv everywhere there would most likely be direct evidence.
And global warming is not tethered to facts but beliefs and faith.