WCRP has considered anthropomorphic climate change at a 90%+ certainty by 2011. It’s as close to settled as one can get at least in that aspect.
Devil’s in the details of course. But that man’s activities have led to a significant and trackable change to the planet’s climate is silly to attack at this point.
You can of course. But there’s better fights to fight.
What they’re arguing about is achieving a better resolution so that they know what actionable steps can be taken.
They’ve long since left any kind of “object of belief” stage.