Carbon dioxide levels dating far back
In an interview with CNBC's "Squawk Box," Pruitt said: "I think that measuring with precision human activity on the climate is something very challenging to do and there's tremendous disagreement about the degree of impact, so no, I would not agree that it's a primary contributor to the global warming that we see.""But we don't know that yet, as far as...we need to continue the debate and continue the review and the analysis," he said.At Grenoble (Laboratory of Glaciology, Geophysics and Environment) one to three ice samples of about 40 grams each are crushed under vacuum conditions, and after about 20 minutes the extracted gas is expanded in the sample loop of a gas chromatograph and analyzed.Depending on the amount of extracted air, three to five successive analyses are done.A man with a nasty habit of suing the EPA now leads it, because why not?" data-reactid="30"SEE ALSO: A man with a nasty habit of suing the EPA now leads it, because why not?The 2000-year record from Law Dome, Antarctica, has been merged with modern records and a spline function was fit to the result to provide a 2000-year time series extending to the present These records are maintained by the World Data Center for Paleoclimatology, National Oceanic and Atmospheric Administration (NOAA), and have graciously been made freely available for access and distribution.
If data accessed from this site are to be used in a publication, we strongly recommend some contact with the principal investigators to be sure the data are being interpreted and used correctly. Maps of Antarctica showing locations and elevations in meters above sea level (masl) of: Law Dome (66°44'S, 112°50'E, 1390 masl), Dome C (75°06'S, 123°24'E, 3233 masl), Taylor Dome (77°48'S, 158°43'E, 2365 masl), Vostok (78°28'S, 106°52'E, 3500 masl), Dome A (80°22'S, 77°22'E, 4084 masl), the South Pole station (90°S, 2810 masl), and Siple Station (75°55'S, 83°55'W, 1054 masl).
The method was developed by Willard Libby in the late 1940s and soon became a standard tool for archaeologists.
Libby received the Nobel Prize for his work in 1960introduced takes a long time to percolate through the entire volume of the ocean.
By looking at past concentrations of greenhouse gasses in layers in ice cores, scientists can calculate how modern amounts of carbon dioxide and methane compare to those of the past, and, essentially, compare past concentrations of greenhouse gasses to temperature. Ice cores have been drilled in ice sheets worldwide, but notably in Greenland and Antarctica[4, 5].
* Solar variation at 65°N due to en: Milankovitch cycles (connected to 18O). Ice core records allow us to generate continuous reconstructions of past climate, going back at least 800,000 years.