The simple truth is we don't know, we cant predict the weather a few days in advance, how can we predict it years. We have theories, ideas, hopes and fears. I fear a mini or worse Yuge ice age not global warming, that would be wonderful, to return to the days of roman empires weather. When Hannibal could ride elephants across the alps...... The warming periods ushered in centuries of growth and prosperity for the world, of course there some losers, there will always be winners and losers.
There's not knowing, and there's not knowing the future with absolute certainty. Everything is about probabilities, and there's world of difference between not knowing at all, and extrapolating based on a mixture of sources.
It's right to be sceptical about models, in a similar way you might be about political polls, because although models are derived from real data, that data is never complete, and has both irregular and much lower spatial and temporal resolution: it's a best guess.
The artful dodger was skillful too.
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