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Palaeoclimatology, the study of past climates, plays an essential role in understanding long-term climate variability and predicting future climate change. Since direct instrumental records of climate extend back only about one and a half centuries, scientists rely on indirect evidence from natural archives to reconstruct past climates over hundreds, thousands, and even millions of years. These indirect pieces of evidence are known as palaeoclimatic proxies. Each source provides unique insights into temperature, precipitation, atmospheric composition, and environmental conditions of the past. The interpretation of these proxies allows us to reconstruct climatic patterns at local, regional, and global scales. The major sources of palaeoclimatic data include ice cores, tree rings, marine and lake sediments, corals, speleothems, pollen records, historical documents, and isotopic and geochemical analyses. Each of these proxies has its own strengths, limitations, and time scales of relevance, but together they create a coherent picture of Earth’s climatic history. One of the most reliable and widely studied sources of palaeoclimatic data is ice cores. Ice sheets in Antarctica, Greenland, and high mountain glaciers preserve layers of snow and ice accumulated over tens of thousands of years. Each layer traps bubbles of ancient atmosphere, dust particles, volcanic ash, and isotopic variations of oxygen and hydrogen. By analyzing the ratios of oxygen isotopes, scientists can infer past temperatures. The trapped gas bubbles provide _____ __________ _________ _______ __________.
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