| Is Global Warming Evident Yet? |
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| q | The global warming observed in the past 100 years |
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| can be a result of natural variability and |
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| anthropogenically induced. |
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| q | Since our understanding of the natural variability is |
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| limited, it is difficult for us to decide whether or not |
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| the human-induced global warming already shows up. |
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| q | The detection of the current anthropogenically |
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| induced signal will be difficult until it is very large. |
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