In this section, we download and preprocess a composite ice core atmospheric carbon dioxide (CO2) data set provided by the World Data Center for Paleoclimatology, National Oceanic and Atmospheric Administration (NOAA){target="_blank"} that extends back 800,000 years. The data may be directly accessed here{target="_blank"} or if the data set is not available you may download a copy here{target="_blank"} (downloaded on 2022-06-14).