Climate change is natural

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"The glacial-interglacial cycles are controlled by changes in the Earth’s tilt and the shape of its orbit that occur in predictable cycles...

Collectively, these three cycles, which were originally discovered by a self-taught university janitor named James Croll, are now known as the Milankovich cycles.
These long-term astronomical changes indicate that changes in CO2 concentration cannot have been the chief reason for warming and cooling in geological time.