This is a scientific question that falls under the field of paleoclimatology. It seeks to understand the complex and multifaceted causes of the Earth's cyclical periods of glaciation and warming over long periods of geological time. The answer to this question involves a range of factors, including changes in the Earth's orbit and tilt, variations in solar radiation, greenhouse gas concentrations, and feedback mechanisms that amplify or dampen the effects of these factors.
To gain a deeper understanding, some follow-up questions that may be considered are, do ice ages start slow or come on suddenly through the expansion of ice sheets and glaciers? How many ice ages has Earth seen over the past few million years? Does Earth's position in the solar system contribute to ice ages? Can human-caused climate change bring about a new ice age?
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