Science is not supposed to be driven by consensus. It is supposed to be driven by the scientific method. You are supposed to design a theory that makes worthwhile predictions about some aspect of the real world and then test it in the real world to ensure it actually predicts stuff. If you are lucky the theory will make predictions of something that people did not expect to happen in the real world but that actually does happen. One example of this would be Special Relativity and the time dilation phenomenon.
AGW theory so far has done no proper predictions about the future. In that regard it is useless as a scientific theory.