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During past ice ages, extensive forest cover was reduced due to colder temperatures and changes in vegetation patterns, leading to decreased carbon dioxide (CO2) absorption. As forests diminished, the amount of CO2 sequestered by these ecosystems declined, contributing to higher atmospheric CO2 levels. Additionally, the increased exposure of soil and organic matter due to glacial processes may have released stored carbon back into the atmosphere. Thus, the interplay between forest cover and CO2 levels during ice ages significantly influenced greenhouse gas concentrations.

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