Man-Made Global Warming Hypothesis, Settled?

A letter from the Orange County Register claims that the science for the man-made global warming hypothesis is "definitely settled". I disagree. By definition, that makes the issue "unsettled". But if that is insufficient, you must consider that support for the global warming hypothesis is based primarily on various and numerous "models". The essence of these models is statistical rather than deductive. Each of these models gives different results and makes different predictions. There is no agreement on which model is correct. If the matter were settled, we would have one, and only one, model. Note we have only one Theory of: Relativity, Quantum Mechanics, Thermodynamics, Electricity and Magnetism, and yes, even Evolution.