There's a great book on this subject called "Unsettled" by Steven Koonin. Climate change modeling is based on statistical modeling. Statistical models are found by fitting the data and are not exact. They are based on certain assumptions which may or may not be true. The underlying data may or may not be accurate. The historical data are mostly obtained from extrapolations and imprecise measurements. The conclusions are stated as fact even in light of all these uncertainties. Koonin shines a light on the whole process which has become politicized simply because very few voters are scientists and people are easily swayed using emotional arguments.
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