Let's evaluate each statement:
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The increase in carbon dioxide since the year 1869 is similar to past increases: False. The current increase in atmospheric carbon dioxide levels, particularly since the Industrial Revolution, is much more rapid than past natural increases observed in geological records.
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Atmospheric composition has remained constant throughout earth’s history: False. The composition of the Earth's atmosphere has changed significantly over geological time, influenced by factors such as volcanic activity, photosynthesis, and human activities.
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Earth is currently in an interglacial period: True. Earth is presently in the Holocene epoch, which is an interglacial period following the last Ice Age.
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Climate has changed naturally over earth’s history: True. Climate has undergone significant changes due to various natural factors, including volcanic eruptions, solar variations, and Earth's orbital changes.
In summary:
- False
- False
- True
- True