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His team compiled an extensive record of Antarctic temperatures and CO2 data from existing data and five ice cores drilled in the Antarctic interior over the last 30 years.Their results, published February 28 in show CO2 lagged temperature by less than 200 years, drastically decreasing the amount of uncertainty in previous estimates.Current polar records show an intimate connection between atmospheric carbon dioxide and temperature in the natural world.In essence, when one goes up, the other one follows.The researchers then compared results from multiple locations to reduce the margin of error.
Most systems of the Paleozoic and Mesozoic are subdivided into series using the terms "Lower," "Middle," and "Upper." The geochronologic counterpart terms for subdivisions of periods are "Early," "Middle," and "Late." The international geoscience community is applying names to these subdivisions based on stratigraphic sections at specific localities worldwide.
“They say, ‘How could CO2 levels affect global temperature when you are telling me the temperature changed first?
’” Frédéric Parrenin of the Laboratory of Glaciology and Geophysical Environment in France and a team of researchers may have found an answer to the question.
Scientists use air trapped in the ice to determine the CO2 levels of past climates, whereas they use the ice itself to determine temperature.
But because air diffuses rapidly through the ice pack, those air bubbles are younger than the ice surrounding them.
For consistent usage of time terms, the USGS Geologic Names Committee (GNC; see box for members) and the Association of American State Geologists (AASG) developed Divisions of Geologic Time (fig. (Also available at Ogg, Gabi, comp., 2009, Global boundary stratotype sections and points (GSSP): International Commission on Stratigraphy, accessed May 10, 2010, at