A big problem with the climate debate is falsified data - especially before 1980. A PhD historian, John Robson researches the records and the history, and has the receipts. His website is climatediscussionnexus.com His expertise is history, records, archives - he does not claim to an expert on climate/atmospheric physics. No matter now expert, you get bad results from false data. One thing I found from my less than expert historical research is that the optimum global CO₂ level is 400 ppm. 300 is too low, and generally has resulted in famine. Greenhouses go for 1200ppm if possible, as that optimizes plant growth (not good globally). So the target they want to reduce CO₂ to is wrong - and no real justification is given. It's almost as if famine (without totally destroying ecosystems) is the point.