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A return to glacial conditions which temporarily reversed the gradual climatic warming after the Last Glacial Maximum. Time Period: approximately 12,900 to 11,700 years ago.

A shift in Earth's climate regime from a 41,000-year to a 100,000-year glacial-interglacial periodicity. Time Period: about 1.25 million to 700,000 years ago.

A warm period during the mid-Holocene when global temperatures were slightly warmer than today. Time Period: 9,000 to 5,000 years ago.

A period during the last ice age when ice sheets were at their greatest extent. Time Period: approximately 26,500 years ago.

A period of Earth's history when temperatures were warmer than today and the Arctic was forested. Time Period: around 5.3 to 2.6 million years ago.

A sudden decrease in global temperatures that occurred approximately 8,200 years before the present, likely caused by a massive discharge of freshwater. Time Period: approximately 8,200 years ago.

The Earth's most severe known extinction event, with up to 96% of all marine species and 70% of terrestrial vertebrate species becoming extinct. Time Period: about 252 million years ago.

A time of warm climate in the North Atlantic region that may have been connected to other warming events around the globe. Time Period: A.D. 950 to A.D. 1250.

The ongoing extinction event of species during the present Holocene epoch, mainly due to human activity. Time Period: roughly 10,000 years ago to present.

A climate change event that resulted in the large-scale collapse of rainforests during the Carboniferous period. Time Period: approximately 305 million years ago.

A global cooling event causing the third-largest extinction in Earth's history, impacting marine life significantly. Time Period: approximately 445 million years ago.