> I'm curious. Gravity has not been proven to attract two masses, for instance?
Correct. That's why it's called the theory of gravity :) You would need Laplace's demon (https://en.wikipedia.org/wiki/Laplace's_demon) for a proof. "Proof" means absolute certainty. You only find that in math, not in the physical world.
As he already said, science doesn't do proofs; proof is something for Math, science does evidence, nothing is ever proven. Asking a scientist for proof merely shows you don't know what science is and thus aren't capable of using it to make decisions.
> Is there any evidence that two masses don't attract ?
The answer to that question does not in any way proof the existence of gravity.
I don't mean to offend, but if you honestly ask these types of questions, I doubt you are able to evaluate the quality of original papers dealing with climate research.
