12. On a large scale the Earth's climate can be divided into Hot House, in which little to no glacial ice exists, and Ice House climate regimes that contain significant continental ice sheets. By this characterization, the current climate on Earth is in an Ice House period because large continental glaciers exist in Greenland and Antarctica. Use the diagram below to count the number of Ice House climates the Earth has experienced in the last 4.6 billion years. Which was the most extreme?

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