Climate reconstruction is the scientific process of creating historical records of past climates based on various pieces of evidence such as ice cores, tree rings, pollen samples, sediment cores, and historical documents. Researchers use these sources to analyze temperature, precipitation, and other climate-related data in order to understand how climate has changed over time and to predict future climate patterns. Climate reconstruction plays a crucial role in understanding the impact of human activities on the environment and in developing strategies for mitigating the effects of climate change.