All one has to do is prove conclusively that something else has caused warming trends other than man-made greenhouse gases, and provide enough weight of evidence for honest scientists who actually are good critical thinkers to find that the evidence points to the alternative.
It isn't some secret, it just takes people who are good at critical thinking, which is not something that political hacks who pretend to be scientists generally excel at.
The right's problem with this is that, like WC and seemingly yourself, you can't envision people who don't really have a political agenda, because you are so mired in your own political blinders that it is inconceivable that there are people who aren't.
"I am a political hack, so EVERYBODY must be a political hack of one shade or another, and incapable of honestly evaluating evidence."
That is an erroneous assumption.