Re: He'll come round.
Big giveaway, that. Science doesn't deal in proof.
We don't need 'proof' that a particular plane is going to fall out of the sky. If we have evidence that it has a 5% chance of crashing - it won't get off the ground.
Science is telling us that there is a 90% (or better) chance that AGW is happening, now, and is likely to get much worse.
But the deniers are determined to fly that plane till it crashed.