Ultimately, everyone has their own personal threshold as to how much risk they feel they can take.

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So the real controversy is what minimum level of solar energy at 65N is the threshold for the descent into an ice age and how unstable the weather becomes near that threshold.

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Even before reading their article, it could be guessed (correctly, as it turned out) that the 90 percent threshold was more an artifact of how the data were selected and grouped rather than anything resembling a natural law.

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