Falsifiable hypotheses, you mean. Can you offer one reasonable hypothesis for why Earth is rapidly warming now? I'll then look to see if it has been tested or not.
Wine vineyards in Cali and France burn up while new ones are cultivated in Sweden. Nah warmer weather zones are not moving up in latitude at all (in Northern Hemisphere, vice versa in S. Hemi). Nope, nope, nope.
The burden of proof is on the crazies making the claims and demanding a restructuring of the world economy while committing acts of terrorism. These people's predictions have been falling on their face for decades and they just keep screaming that they know what's going on and that anyone who notices their grifting is a denier.
So you do not have a single hypothesis for why Earth is rapidly warming. What use are you in this conversation?
I was thinking "motivated reasoning". He started with values, "restructuring the economy", "acts of terrorism" to make the argument [Earth is not warming; Earth is warming but it's not humans doing it; It's humans doing it but it won't hurt; It will hurt but it's too expensive to fix]. I presented that as a set, since I don't know where he is on the spectrum of denial yet.