Ice core sampling is a scientific method used to study past climates by extracting cylindrical sections of ice from glaciers and ice sheets. These cores contain layers of ice that have formed over thousands of years, trapping air bubbles, dust, and other particles. By analyzing these layers, researchers can gather information about historical temperatures, atmospheric composition, and even volcanic activity. The process involves drilling deep into ice formations, often in remote locations like Antarctica or Greenland. Each layer of ice represents a year or season, allowing scientists to reconstruct climate data over millennia. This information is crucial for understanding climate change and its impacts on the planet.