tigersnake said:
Data will convince me, data.
I draw parallels to a speech made by Friedrich von Hayek when given his Nobel prize; "The pretence of knowledge". He talks about the problem with economists ability to explain and understand the economy, something I think is similar to scientists ability to explain and understand the climate.
Describing the attempt by economists to apply the scientific method used in the physical sciences in explaining economics: "It is an approach which has come to be described as the "scientistic" attitude - an attitude which, as I defined it some thirty years ago, "is decidedly unscientific in the true sense of the word, since it involves a mechanical and uncritical application of habits of thought to fields different from those in which they have been formed."
Given the number of fields of science that climate science incorporates, I'd argue that many so called experts today comment on climate science in this manner, i.e. "a mechanical and uncritical application of habits of thought to fields different from those in which they have been formed."
Still one could argue what the hell has this got to do with climate science? It is a physical science, ergo isn't it appropriate to use for climate science? This is why I draw a parallel:
"The theory which has been guiding monetary and financial policy during the last thirty years, and which I contend is largely the product of such a mistaken conception of the proper scientific procedure, consists in the assertion that there exists a simple positive correlation between total employment and the size of the aggregate demand for goods and services; it leads to the belief that we can permanently assure full employment by maintaining total money expenditure at an appropriate level."
Something as complex as the economy, it is strange that one relationship is deemed the be all and end all. I'd compare this to the relationship between CO2 levels and global temperature. We can assure constant temperature by reducing the amount of CO2 man emits to the atmosphere to an appropriate level!
He goes on:
"This brings me to the crucial issue. Unlike the position that exists in the physical sciences, in economics and other disciplines that deal with essentially complex phenomena, the aspects of the events to be accounted for about which we can get quantitative data are necessarily limited and may not include the important ones. While in the physical sciences it is generally assumed, probably with good reason, that any important factor which determines the observed events will itself be directly observable and measurable, in the study of such complex phenomena as the market, which depend on the actions of many individuals, all the circumstances which will determine the outcome of a process, for reasons which I shall explain later, will hardly ever be fully known or measurable. And while in the physical sciences the investigator will be able to measure what, on the basis of a prima facie theory, he thinks important, in the social sciences often that is treated as important which happens to be accessible to measurement. This is sometimes carried to the point where it is demanded that our theories must be formulated in such terms that they refer only to measurable magnitudes."
I'd argue climate science is indeed a complex phenomena, and there exists a mountain of unobserved and unmeasured variables that are not taking into account, and indeed are thought of as unimportant for that reason. I'd also argue that this is why climate models will always be wrong.
Hayek summises:
"On this standard there may thus well exist better "scientific" evidence for a false theory, which will be accepted because it is more "scientific", than for a valid explanation, which is rejected because there is no sufficient quantitative evidence for it."
It is a fantastic read: http://www.nobelprize.org/nobel_prizes/economics/laureates/1974/hayek-lecture.html