Low atmospheric carbon dioxide concentrations during glacial periods must have been accompanied ... Figure 1: Glacial–interglacial changes in deep-sea carbonate ion concentration.

There are times when the global climate is warmer (interglacial phases) and times when it has been cooler (glacial phases), when there have been ice ages. The last major cold period was known as ...

Glacial and interglacial periods are thought to alternate depending on changes in Earth's axial tilt and orbit around the sun.

At this time the Eemian Interglacial ended and was followed by the Weichselian Glacial which ended 15,000 years ago.