The key word in your sentence is "infer." That's what the global warming models supposedly do.
I thought the article made a lot of good points, such as the Tovalu, beaches eroding (or not), and the comparison to what we are going through right now.
I thought the point(s) he made about the global warming computer model and using historical evidence (which while not up to modern science standards is nevertheless there)to counter the claims were made with a bit of humor.
Now to the scientists and suedo-scientists here, those who use threads here to prove their superiority to the rest of us in various fields by getting into the minutiae---as far as U an concerned, you need to get over it or stroke your egos in private mail.
I'm not a scientist, but I can certainly see the political agenda in the use of global warming claims to try to get us all in line and handing over our lives and goods to those who know best how to herd us along.
vaudine