In many fields of science you can just go check the results in your own lab. But in climate science, that is often impractical. And even when it is practical, there may be nobody interested in going to do it. Oil companies and climate skeptics probably won't bother to go out and get tree rings because they're not worried about global warming. If climate scientists want people to listen, then they have to have credibility. We don't have to prove them wrong. They have to prove their case. The default if they don't prove their case is that we will just continue using the cheapest energy available as we have been doing. I suspect that as more and more people find out about Mike's Nature trick, and climate science's defense of it, there will be less and less support for spending a lot of money on global warming. Mike's Nature trick will continue to destroy climate science until climate science disclaims it.
To spite my pointed and repeated challenge for you to disclaim or defend Mike's Nature trick, you still will not. Your refusal only hurts the credibility of your side. It makes it look like you know there is no defense.