If they think its not happening then they would know the percentage, they would say its zero.
If they think there is even 1% of the climate changing through human influence then they accept that anthropogenic climate change is happening.
Finally, an answer -- one that confirms that the "consensus" is total bullshit.
According to Frankfooter, the "consensus" on "anthropogenic climate change" includes researchers who believe that changes in the temperature are overwhelmingly caused by natural factors and that human emissions are a non-issue. Indeed, his consensus includes researchers who believe the impact of man-made emissions is minuscule.
Franky said it himself. According to the B.S. way these things are being calculated, anyone who puts the human influence above zero is counted as part of the "consensus."
That means the "consensus" includes all of those researchers -- Judith Curry, John Christy, Richard Lindzen, etc. -- that Franky and his buddies usually dismiss as "deniers."
Indeed, it means many members of the "consensus" are researchers who think the IPCC has got it completely wrong.
The claims of a "consensus" are meaningless. It is a fairy tale.