The Three Sisters (climate reconstruction)

The Three Sisters in climate reconstruction refer to three key natural indicators—tree rings, ice cores, and sediment layers—that scientists study to understand past climates. Tree rings reveal yearly growth patterns affected by climate conditions. Ice cores, drilled from glaciers, contain trapped air bubbles reflecting ancient atmospheric composition. Sediment layers at the bottom of lakes and oceans accumulate over time, recording changes in temperature, vegetation, and other environmental factors. Together, these sources provide a comprehensive timeline of Earth's climate history, helping scientists learn about past variations and predict future climate trends.