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Keeling Curve
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===Global monitoring=== Due in part to the significance of Keeling's findings,<ref name="rewards" /> [[National Oceanic and Atmospheric Administration|NOAA]] began monitoring CO<sub>2</sub> levels worldwide in the 1970s.<ref>Keeling, Charles D. (1978). "The Influence of Mauna Loa Observatory on the Development of Atmospheric CO<sub>2</sub> Research". In ''Mauna Loa Observatory: A 20th Anniversary Report''. (National Oceanic and Atmospheric Administration Special Report, September 1978), edited by John Miller, pp. 36β54. Boulder, CO: [[NOAA]] Environmental Research Laboratories.</ref> Today, atmospheric CO<sub>2</sub> levels are monitored at about 100 sites around the globe through the Global Greenhouse Gas Reference Network.<ref>{{Cite web|url=https://www.esrl.noaa.gov/gmd/ccgg/|title=ESRL Global Monitoring Division - Global Greenhouse Gas Reference Network|last=NOAA, Earth System Laboratory|first=US Department of Commerce Research|website=www.esrl.noaa.gov|language=EN-US|access-date=2018-11-25}}</ref> Measurements at many other isolated sites have confirmed the long-term trend shown by the Keeling Curve,<ref>[https://scrippsco2.ucsd.edu/graphics_gallery/other_stations/global_stations_co2_concentration_trends.html Global Stations {{CO2}} Concentration Trends]. Scripps CO<sub>2</sub> Program.</ref> although no sites have as long a record as [[Mauna Loa Observatory|Mauna Loa]].<ref name="KeelingWhorfContinuous">{{cite web|url=http://cdiac.ornl.gov/trends/co2/sio-keel-flask/sio-keel-flaskmlo_c.html|title=Atmospheric CO<sub>2</sub> from Continuous Air Samples at Mauna Loa Observatory, Hawaii, U.S.A.|last1=Keeling|first1=Charles D.|last2=Whorf|first2=T. P.|date=2004|access-date=2007-10-17|archive-url=https://web.archive.org/web/20160303173428/http://cdiac.ornl.gov/trends/co2/sio-keel-flask/sio-keel-flaskmlo_c.html|archive-date=2016-03-03|url-status=dead}}</ref>
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