Britannica Sources used in this answer

How did Earth’s climate change after the Last Glacial Maximum?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

A detailed geologic time scale chart displaying Earth's history from the Hadean Eon over 4.5 billion years ago to the present, organized by eons, eras, periods, epochs, and ages with color-coded columns and corresponding dates in millions of years. — Holocene Epoch The stratigraphic chart of geologic time.

Following the Last Glacial Maximum (LGM), which peaked approximately 21,000 years ago, Earth experienced a significant transition toward the warmer, relatively ice-free conditions of the Holocene Epoch.1

The warming process began around 19,000 years ago, triggering the retreat of massive continental ice sheets and a substantial rise in sea levels as meltwater returned to the oceans. This deglaciation was not uniform; it was punctuated by transient cooling events, most notably the Younger Dryas (12,900–11,600 years ago).234

As the climate shifted, the following changes occurred:
* Atmospheric and Oceanic Shifts: The retreat of ice sheets altered atmospheric circulation and ocean currents, which had been significantly impacted by the blocking action of glacial ice.52
* Biological Migration: Marine species, such as foraminiferans, migrated poleward by thousands of kilometers to remain within optimal temperature habitats.5
* Landscape Transformation: Rising seas inundated continental shelves and submerged land bridges, such as Beringia, which had previously facilitated the migration of plants and animals.34