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I was asked if I believe in CC and said: "Yes. The climate changes constantly. Please tell me when CC started" I never get an answer. How difficult is it to tell me when CC started? Was it 1600? 1700? 1800? 10,000 B.C.E.? 1970? When Maurice Strong started riding a bicycle? When? I especially like asking younger folks this question. They seem to STHU.
DC is a symptom, not the cause. The cause is basic voter stupidity and economic ignorance.
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I think one MAJOR problem with any climate model is that you have only past data (presuming those data are accurate). You can only fit your model to the past and then dot dot dot.
I'm sure I could fit any number of equations that closely paralleled past data. Most would be entirely nonsensical of course, like whether the AFL won the Superbowl etc.
Then there is the clear problem of what we simply cannot know, like the impact of permafrost melting. We can sort of calculate how bad that could be, but it COULD be far worse. Other factors are changes in ocean currents, the jet stream, changes in ocean plankta growth rates, it goes on for miles.