Herm said:
Another interesting article from the ever handy WUWT blog, force yourself past the physics at the beginning.. the good stuff is about half way down, the models are spanked:
http://wattsupwiththat.com/2012/03/02/why-cagw-theory-is-not-settled-science/" onclick="window.open(this.href);return false;
I read the whole thing. And yes, I can sympathize with a lot of the arguments there about the lack of precision...but to quote Dr Brown
"but it is very clear indeed that the latter 19th through the 20th centuries were far from normal by the standards of the previous ten or twenty centuries."
You left that out of your previous quote.
Anyway, you wonder why this of all things is "very clear" to him, while at the same time he takes issue with imprecise measurements elsewhere? Does he believe the records after all then?
The reference to the sun-spot activity he makes has been refuted recently, not sure if he was aware of that at the time of his post? The reference to the world wars and the nuclear testing seems as much BS as he thinks climate science is...If anything, nuclear testing would COOL the planet not warm it (which maybe explains the cooling back in the 50s and 60s he mentions???)
Does this make Dr. Brown very credible? I dont think so.
Unlike pure physics, in most other science it is often impossible
to get precise data and statistics play a much more important role. You dont have to nail global
temperatures to high precision, you only need to establish a trend.
If you have that AND a plausible physical model (increased CO2 emission in the last 150 years) it is LIKELY that there exists a causal relationship. Not acting on things because we are not 100 % ( or 99.999999 %) certain,as Dr. Brown suggests, is foolish...But then we knew that climate deniers are mostly fools (or crooks with an agenda)...
People in physics do not like likelihoods as much as everybody else. I think in order to establish a result there you need p<1e-6 or so (i.e. a one in a million chance that your observed result is a fluke), whereas in the life sciences people are happy with one in twenty.
As far as a potential global catastrophe goes, even a one in two chance of it not being bogus would give me pause.
Besides, the other benefits of abandoning CO2 producing technology go beyond avoiding a "putative" global warming anyway.