“It’s the Sun, stupid.”
Cosmic rays means “the sun”.
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“Cosmic rays means “the sun”.
Actually, cosmic rays originate outside our solar system
Cosmic rays are not of solar origin. Cosmic rays have long been suspected of influencing cloud formation, but their effect on climate stability has not been established.
Variability in solar output does not appear to be a major factor.
Milankovich cycles, related to the shape of the earth’s orbit, phasing between the vernal equinox and soltices, and variations in obliquity seem to be directly and strongly related to ice ages.
Current century-length variations do not have any simple and widely accepted explanation, nor is it even clear that we are in an anomalously warm period. Cosmic rays may be the cause, as may increases in carbon dioxide. Regardless, it is not settled science.