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Learn how scientists extract core samples of ancient ice and use these ice cores to create mathematical models that can help them predict Earth's future climate. By measuring the greenhouse gas contents of tiny air bubbles that were trapped in the ice thousands of years ago, scientists can compare these readings with temperature data and look for connections. A scientist demonstrates the process by which gases are extracted from ancient air and analyzed using a chromatograph. Another scientist describes the different "thermometers" used to determine past temperature.
Adapted from the WAIS Divide Video Series.