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Researchers onboard the ocean drillship JOIDES Resolution, pictured here, study Earth’s climate history over millions of years. The earliest measurements of Earth's climate using thermometers and other tools start in the 1850s. To look further back in time, scientists investigate air bubbles trapped in ice cores, expanding the scope of climate records to nearly a million years.
But to study Earth's history over millions of years, researchers examine the chemical and biological signatures in deep-sea sediments. New research looks at changes in Earth's temperature and atmospheric carbon dioxide since the end of the age of the dinosaurs. The evidence is in sediment cores retrieved from beneath the seafloor by geologists working aboard the JOIDES Resolution.Image credit: IODP-USIO
