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Global Climate Change

Global Climate Change

Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.

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Related Experiment Video

Updated: Jul 11, 2026

Using Generative Art to Convey Past and Future Climate Transitions

Using Generative Art to Convey Past and Future Climate Transitions

Published on: March 31, 2023

The atmosphere during the younger dryas.

P A Mayewski, L D Meeker, S Whitlow

Science (New York, N.Y.)

|July 9, 1993

Summary

The Younger Dryas climate event ended rapidly, within 10–20 years. Greenland ice core data reveal dramatic, frequent atmospheric shifts during this period, linked to polar atmospheric circulation changes.

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Area of Science:

Paleoclimatology
Climate Science
Glaciology

Background:

The Younger Dryas was a significant climate event during the last deglaciation, marked by a return to glacial conditions.
Marine and ice core records provide evidence of this abrupt climate change.

Purpose of the Study:

To reconstruct the atmospheric conditions during the Younger Dryas using high-resolution glaciochemical data.
To determine the timing and nature of atmospheric changes associated with the onset and termination of the Younger Dryas.

Main Methods:

Analysis of high-resolution, continuous glaciochemical records from central Greenland.
Interpretation of chemical composition data to infer atmospheric conditions.

Main Results:

The onset and termination of the Younger Dryas occurred rapidly, within 10 to 20 years.
Massive, frequent, and short-term (decadal or less) changes in atmospheric composition were observed throughout the Younger Dryas.
Atmospheric composition shifts are linked to changes in the polar atmospheric cell and biogenic source regions.

Conclusions:

The Younger Dryas was characterized by rapid and significant atmospheric variability.
Changes in atmospheric circulation and biogenic sources played a key role in driving Younger Dryas climate dynamics.