Proxy reconstructions are a method used in climate science to reconstruct past climate conditions. Instead of relying solely on instrumental data, researchers use indirect evidence, or proxies, such as tree rings, ice cores, sediment layers, and coral records, to infer past climate conditions. These proxies provide valuable information about temperature, precipitation, and other climate variables dating back hundreds or even thousands of years. By analyzing these proxy data, scientists can better understand natural climate variability and long-term climate trends, which can help improve climate models and projections for the future.