Over the past 900,000 years the earth's atmosphere has been remarkably steady, not undergoing cycles of warming and cooling.

Question

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The earth's atmosphere has undergone cycles of warming and cooling over the past 900,000 years, as evidenced by data from ice cores and other sources. This is known as the Pleistocene ice age cycle, which is characterized by repeated glacial and interglacial periods.

Over the Past 900,000 Years the Earth's Atmosphere Has Been