Tag Archives: climate change

Milankovitch theory, maybe wrong after all?

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Here is a preprint for our forthcoming chapter in the Encyclopedia of Climate System Science. Our perspective is that ice sheet, ocean circulation and global carbon cycle are critical to the development of ice ages, which are not simply caused by changes in Earth’s orbit as Milankovitch would have it.

Here is a preprint for our forthcoming chapter in the Encyclopedia of Climate System Science. Our perspective is that ice sheet, ocean circulation and global carbon cycle are critical to the development of ice ages, which are not simply caused by changes in Earth’s orbit as Milankovitch would have it.

Hain-and-Sigman-2026-ECSS-Milankovitch-uncorrected-proof

Dynamic carbon cycle and climate, the Earth System

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In a new chapter for the third edition of the Treatise on Geochemistry with Kat Allen and Sandy Kirtland Turner, we systematically analyze the dynamics that couple climate and carbon cycle through CO2 radiative forcing. This includes the first analytical derivation of the silicate weathering timescale. The relevant context of proxy systems for climate and carbon cycle and terminology for coupled climate-carbon cycle change is intended to introduce Earth System science.

Hain-et-al-2025-Treatise

Ice ages without greenhouse gas change?

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In a perspective on Quaternary climate change with Tom Chalk, published in the Encylopedia of Quaternary Science, we question the conventional wisdom that ice ages result from regular changes in Earth’s orbit or some other purely physical mechanism. We argue instead that the global carbon cycle and greenhouse gasses need to be included as a cause of climate change.

Hain-and-Chalk-2024-EQS-Milankovitch-vs-CO2