Ice Age ~upd~ Jun 2026

Intervals of extreme cold where ice sheets expand to cover vast portions of the Northern Hemisphere.

Within an ice age, the climate "flip-flops" between two stages: American Museum of Natural History Glacial Periods: Colder phases where ice sheets expand significantly. Interglacial Periods: Warmer phases where ice sheets retreat. Current State: We are in an interglacial period called the , which began about 11,700 years ago. 🐘 Ice Age Wildlife (Megafauna) Ice Age

Since the Industrial Revolution, we have pumped vast quantities of CO2 and methane into the atmosphere. The current level of CO2 (over 420 ppm) is the highest it has been in 3 million years—before the Quaternary truly intensified. Intervals of extreme cold where ice sheets expand