On Fourier transforms, the little experience I have is from 20 years ago, so I couldn’t comment on that part of LW18 much. One thing I was wondering about inverse Fourier transform was that is it possible there to control the phases of the sine waves so that one can for example force all three sine waves peak at certain points? For example, if one would like to make it appear that those three sine waves create the recent warming, would it be possible to force the sine waves to peak at about year 2000?

]]>I can see how using a Fourier transform might cause the warming of the last 65 years to be ignored, since a single time-domain step is spread out in the frequency domain. Relying heavily on a Fourier transform seems like a variation on “assuming the conclusion” – the conclusion being that natural cycles control climate. Fourier transforms are the perfect tool for finding cycles and downplaying singular events.

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