Here are the answers to your true or false statements:
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Earth is currently in an interglacial period: True. Earth is currently in the Holocene epoch, which is an interglacial period following the last Ice Age.
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The increase in carbon dioxide since the year 1860 is similar to past increases: False. The rate and amount of increase in atmospheric carbon dioxide since the Industrial Revolution (around 1860) is unprecedented in the context of geological history.
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Climate has changed naturally over Earth's history: True. The Earth's climate has undergone significant changes throughout its history due to various natural factors, including volcanic eruptions, changes in solar radiation, and variations in Earth's orbit.
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Atmospheric composition has remained constant throughout Earth's history: False. Atmospheric composition has varied significantly over geological time, influenced by volcanic activity, biological processes, and other factors.
If you have any further questions or need clarification, feel free to ask!