Sanity Checks
When I was learning science at school, I was always taught about the need to sanity check things. If you are calculating the speed of a body, when you have your exact answer, go back and think of an approximation to the answer and make sure they match. How easy is it to solve s = u.t + 1/2 .a.t^2 to find t when s, u, a are known, and mistakenly pick the negative result from the quadratic equation for example.
This article is clearly talking about those sanity checks. If you build a model, and you are trying to calculate the feedback mechanisms, you know some feedback is positive and some is negative, but you don't know every feedback mechanism in existence. When you end up with a very large positive feedback in total, any engineer will tell you the system is likely to be unstable, and that doesn't seem to correspond to history. You are therefore clearly missing something.
Now, if you start to look more deeply at the "science" behind climate change, as I have, it starts to get interesting. Papers are put up for peer review. Now peer review has a tendency to look at process and make sure you aren't doing something silly. They also tend to make sure you follow your assumptions. But when you have assumed that feedback processes are limited to a small handful of the possible processes, your science may be valid, but your conclusions aren't relevant to the real world.
Take the question about water vapour. This is the biggest greenhouse gas, but one of the least understood. When the sea gets warmed up, it releases water vapour, this water vapour is a greenhouse gas, so we get positive feedback, and the earth gets hotter. But, when the air reaches a certain saturation point we start to see cloud build-up. This cloud build-up results in different types of clouds depending on other factors, like the vertical temperature gradient, etc. If we get high level cirrus clouds, this also has a greenhouse effect and results in positive feedback. If we get lower level cumulus or cumulo-nimbus clouds, this has a tendency to reflect solar radiation, but insulate the ground layers, so we see a dampening effect where differences between day and night temperatures reduce. The problem is the difference between different systems can be very small. Just look at the boundary between tropical regions and desert around the world. What defines one region and not the other - its a fine line. Get it wrong and your models will be wildly incorrect - desert on the one hand, tropics and teeming wildlife on the other.
Some of these climate models though just need people to stand back and think, this doesn't make any sense. Something has to be wrong. Its this type of thinking which leads to so many changes in the "consensus opinion" in modern science. In fact, think back a few years, a patent clerk questioned Newtonian mechanics, he said they didn't make sense at speeds approaching light speed. Was he qualified to ask these questions - technically no. Was he right - yes, for the time being.
Consensus opinions change in science all the time. They change by people asking hard questions, and going back to fundamentals, rather than considering things down in the weeds. In science, a dissenting opinion is actually crucial. Those people whose response to dissenting opinions is to shoot the messenger, have missed the whole reason for scientific debate. And those who fund only 1 side of the argument are being fundamentally dishonest. The argument is far from over, even a biased report like the IPCC recognises this when it says that certain climate changes are "likely" or "very likely", but never "almost certain".
All I ask for is that the argument be conducted scientifically, and that the religious fervour or many, especially on the green side, is removed from the debate. If we got rid of the religious comments on this forum for example, it would reduce the size of the response list by 60-70% (as an estimate), and leave you with some nice scientific argument from both sides.