I wouldn't care if they were 100% sure. (I won't lower myself intellectually to the 150% ignoramuses)
It has been documented beyond any doubt whatsoever that any purely scientific findings of the IPCC are inevitably perverted to political statements, projections and recommendations with no basis in reality, or in the science it purports to represent.
Computer models is the most egregious example.
Those pseudo political "scientists" should read Mark Twain's Life on the Mississippi, where he discusses the ultimate length of the river based on past observations. It's a great laugh, but perhaps not for the climate-carbon-credit scammers.
I’m sure their models will predict 110% certainty the next time around.