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of years eventually leads to residual ice sheets, which would also reflect light away from the earth, further cooling the earth. A decrease in greenhouse gas concentrations such as CO₂, are a result of the expanded ice sheets. This is because as the Earth cooled, and ice sheets expanded, the ocean waters became colder, which then could absorb more CO₂ from the atmosphere. These factors all feedback into each other: as the ice sheets extended, more CO₂ was absorbed, and more light

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