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He walks through how oxygen isotopes in ice cores reveal ancient temperature shifts. When ocean temperatures rise, more energy becomes available to evaporate water. The heavier oxygen-18 isotope falls to Earth first during precipitation, leaving a measurable signature in snow and ice. By analyzing the ratio of oxygen-18 to oxygen-16 in ice core samples, researchers can reconstruct past climate conditions with remarkable precision. This isotopic record provides direct evidence of temperature fluctuations stretching back hundreds of thousands of years, offering a window into natural climate variability that predates human influence.