For added reference, this is due to astronomical[1], atmospheric, and tectonic causes [2]. Obviously human beings have no control over astronomical or tectonic factors. The claim that the atmospheric factor can override both the astronomical and tectonic factors isn't implausible, but it should be understood that the atmosphere isn't the only or even the primary factor determining the climate.

[1] https://en.wikipedia.org/wiki/Milankovitch_cycles [2] https://www.geocraft.com/WVFossils/ice_ages.html