Asked by Ian
True or false: Earth is currently in an interglacial period. True or false: The increase in carbon dioxide since the year 1860 is similar to past increases. True or false: Atmospheric composition has remained constant throughout Earth's history. True or false: Climate has changed naturally over Earth's history.
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1) True. Earth is in the current interglacial (the Holocene) within the ongoing Quaternary glacial–interglacial cycle.
2) False. The post‑1860 rise in CO2 is much faster and larger than typical natural increases recorded in ice cores over the last several hundred thousand years; the recent ~100+ ppm rise has occurred in a century‑scale interval unlike most past changes.
3) False. Atmospheric composition has varied greatly over Earth history (e.g., very high CO2 and almost no O2 early on, then the Great Oxidation Event, and many other shifts).
4) True. Climate has changed naturally many times due to factors like orbital cycles, volcanic activity, plate tectonics, solar changes, and greenhouse gas variations.
2) False. The post‑1860 rise in CO2 is much faster and larger than typical natural increases recorded in ice cores over the last several hundred thousand years; the recent ~100+ ppm rise has occurred in a century‑scale interval unlike most past changes.
3) False. Atmospheric composition has varied greatly over Earth history (e.g., very high CO2 and almost no O2 early on, then the Great Oxidation Event, and many other shifts).
4) True. Climate has changed naturally many times due to factors like orbital cycles, volcanic activity, plate tectonics, solar changes, and greenhouse gas variations.
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