It's crazy to think about where this data is coming from. To recover temperatures over such long time periords, samples where taken from over 5,100 trees, 2,300 ocean sediments, 800 boreholes, 351 coral reefs, and 170 ice cores, historical paper records, and more.
www.ncei.noaa.gov/products/pal...Paleoclimatology
NCEI manages the world's largest archive of climate and paleoclimatology data. Our mission is to preserve and make this data and information available in order to understand and model environmental va...