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Our results suggest weak to moderate coupling between CR and year-to-year changes of GT," they write. "However, we find that the realized effect is modest at best, and only recoverable when the secular trend in GT is removed." This "secular trend" is the warming widely believed to be caused by excess carbon in the atmosphere, an effect the researchers accounted for by first-differencing. "We show specifically that CR cannot explain secular warming, a trend that the consensus attributes to anthropogenic forcing. Nonetheless, the results verify the presence of a nontraditional forcing in the climate system, an effect that represents another interesting piece of the puzzle in our understanding of factors influencing climate variability,While they might simply be trading one effect for another with that sort of language, or they might simply be latching on the to Forbush decrease signal, it seems to me that they set out to prove that CR's aren't affecting trend. The fact that they show a link at suggests there's at least some merit to Svenmark's cosmic ray theory.
Comment:
Meteor: Shooting star plummets from New Zealand nightsky