Even if The Emails discredit all the “science” on tree-rings, there’s still ice cores and bore hole data. And even if all paleoclimatology is BS, thermometer readings of temperatures show a sharp spike in the last couple of decades.
One piece of evidence for AGW has, perhaps!, been discredited. Not all evidence has been discredited. We still know C02 is a green house gas, humans have been pumping tons of it into the air and there’s the direct evidence of warming. There is no reason at all to think the AGW theory is a “scam” or a “fraud”.