Here's my contribution to the global warming debate, which I posted at Crooked Timber:
ß¬◊, regarding your post 118: That hockey stick graph you link to says right on it: “Data from thermometers (red) and from tree rings, corals, ice cores and historical records (blue).”
Excuse me while I puke over the poor quality of the facade of science being used to justify international socialist regulation of the world. If you’re going to rule the world under the banner of science, could you at least choose some real science, instead of pushing this pseudo stuff onto the podium for forced applause? No, I guess that would be out of character for a real socialist not to make the platform offensive to truthfulness as a test of party loyalty.
(In case you have trouble seeing the problem revealed in the disclaimer for the graph on your own, here are some starter points you should be able to think about for yourself to understand why this is poor quality, unreliable science, which are points in addition to the devastating criticisms of the hockey stick data and statistical methods that have been published:)
Tree rings don’t make a good proxy for temperature, when the species selected are more sensitive to rainfall, humidity, CO2, and maybe a hundred other things than temperature. Corals are an interesting choice of data. That might tell you something about whether there were El Nino oscillations or other changes in circulation in tropical oceans in the past and how strong they were. Ice cores have a selection bias: They can’t possibly exist from places and times that were much warmer in the past. The ice would have melted away. Taking gas content measurement of ice cores as revealing absolute differences in the past requires ignoring that life and chemistry can still happen on and in glaciers.
If a climate historian puts enough proxies that are partial guesses together and averages them, the resulting graph might have some bumps that correlate with what actually happened, but the absolute temperature signal is totally lost in the choice of how to balance various inaccurate estimates.
Posted by sonny · January 6th, 2006 at 3:45 am