Al_U_Card, on 2017-March-20, 12:31, said:
Okay, no problem. My rep notwithstanding, are climate models (the source of "confirmation" of climate catastrophe) reliable and to be trusted as a guide to how to remedy, if possible, our deleterious effect on global climate?
Every area of science uses a model. Newton's Laws are a model, as are relativity and quantum mechanics. So I have no issue with the use of models. Where I think there is legitimate concern at present is in terms of the sensitivity. There have been a number of papers in the last years pointing towards a sensitivity figure lower than the majority of models are using and the teams behind them have seemingly been slow to react to this, probably believing this to be a temporary anomaly rather than a solid figure. This sensitivity issue also points to one of the serious issues with the models - despite their complexity, a relatively simple adjustment has a huge impact on the long-term trend and the complexity seems to come back as "noise" around this long-term trend. That may be unavoidable, of course, but it means that getting the underlying sensitivty figure correct is absolutely praamount to the models making reliable estimates.
There are also still some other open questions too - clouds is one that gets mentioned often and is still controversial. Perhaps even more important is the question of ocean current cycles. It is well known that some of these have a major impact on climate but it is doubtful that we are currently modelling all of the interactions. Once these are fully udnerstood, we should be able to recalibrate the factors in the models for greatly increased accuracy.
Perhaps the resulting models will show a warming trend that is negligible or even non-existent. Or perhaps we are even underestimating at present. Modelling is absolutely the correct approach though, whichever side of the debate you stand on.
As for a guide on how to remedy the situation, that is a different question entirely and goes somewhat beyond the science itself. It is my considered belief that we possess the technology already to do so if we were really to want to, for example by building aeroforming devices (aka artificial trees). The question is more about who pays, when and in what form. But that moves over into the political sphere rather than the scientific one.