| Questions Addressed by Chapter 2 |
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| 1. | How much is the world warming? |
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| 2. | Is the recent warming unusual? |
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| 3. | How rapidly did climate change in the distant past? |
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| 4. | Have precipitation and atmospheric moisture changed? |
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| 5. | Are the atmospheric/oceanic circulations changing? |
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| 6. | Has climate variability, or have climate extremes, changed? |
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| 7. | Are the observed trends internally consistent? |
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