claim: [ Models ] are full of fudge factors that are fitted to the existing climate, so the models more or less agree with the observed data.
evidence: A good theory : Is elegant ( Formal elegance; no ad hoc modifications ) Contains few arbitrary or adjustable elements ( simplicity / parsimony ) Agrees with and explains all existing observations ( unificatory / explanatory power ) Makes detailed predictions about future observations that can disprove or falsify the model if they are not borne out.