"Science is not supposed to be driven by consensus."
It isn't and nobody ever said it was. You're arguing against position that nobody believes.
Scientific consensus is only important as a signal to the general public. When a scientific consensus forms around a new theory it signals that the evidence for a theory is so strong that it has convinced a large majority of scientists in a field of study that the theory is accurate. It tells us "you can take the theory seriously now".
"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."
I'm not a Climatologist but I'm pretty sure that is exactly what they've been doing: Making predictions and testing them.
I suspect that the recently launched Orbiting Carbon Observatory satellite is going to collect data that will be used to test some predictions climate science has made about the sources and sinks of carbon.