Reply #8: Some still dispute the theory [View All]

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The main argument in favor of Milankovitch theory is the dominance of precession, obliquity, and eccentricity frequencies in both insolation changes and the climate record. |For opposing viewpoints, see Winograd et al., 1992; Muller and MacDonald, 1997; Wunsch, 2004|. The main challenge is that high-latitude summer insolation is dominated by 19- and 23-kyr precession cycles, but late Pleistocene glacial cycles are 100 kyr and early Pleistocene glacial cycles are 41 kyr. The many variations of Milankovitch theory created to account for this discrepancy are collectively known as theories of orbital forcing, due to their emphasis on the role that Earth's orbital configuration plays in controlling insolation. However, the specific mechanisms by which insolation changes produce observed climate responses are still poorly understood; some recent theories are presented in Section 1.3.

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