"Of course, to show that cosmic rays were actually responsible for some part of the recent warming, you would need to show that there was actually a decreasing trend in cosmic rays over recent decades – which is tricky, because there hasn’t been (see the figure)."
|Figure 2 from RealClimate without a trend line fit to the data|
The "real climate scientists" at RealClimate, however, fail to plot a trend line to back up their claim. Plotting a polynomial fit to the same Oulu Neutron Monitor monthly data shows that cosmic ray counts did in fact show a long term declining trend from 1964 to 1997/1998, and a rising trend since, in accordance with the trend in global temperatures which rose to a peak in 1998 and have declined since.
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