<p>Ice Core data for Atmospheric CO2 related to the glacial cycles<br> This graph shows the newest Ice Core data for Atmospheric CO2 from air bubbles in the ice. I tried to connect it to the glacial cycles by marking 230 ppm as a transition level and colored "glacial periods" blue and interglacial periods yellow. There's a clear 80,000-110,000 period of repeating glacier even if they vary in quality.
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Human deforestation and burning of fossil fuel has raised atmospheric CO2 to over 380 ppm in the last century, well above pre-industrialized levels, and "off the scale" of this graph top.
Tom Ruen <a href="https://en.wikipedia.org/wiki/User:Tomruen" class="extiw" title="en:User:Tomruen">en:User:Tomruen</a>
2005-12-03
<p>Source data: (Combined)
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<ol><li>Law Dome: 1006 A.D.-1978 A.D
<ul><li><a rel="nofollow" class="external free" href="http://cdiac.esd.ornl.gov/ftp/trends/co2/lawdome.combined.dat">http://cdiac.esd.ornl.gov/ftp/trends/co2/lawdome.combined.dat</a></li></ul></li>
<li>Vostok ice core: 417,160 - 2,342 years BP
<ul><li><a rel="nofollow" class="external free" href="http://cdiac.esd.ornl.gov/trends/co2/vostok.html">http://cdiac.esd.ornl.gov/trends/co2/vostok.html</a></li></ul></li>
<li>Dome C ice core: 650,000 - 415,000 BP-(or 648th millennium BC to 413th millennium BC)
<ul><li><a rel="nofollow" class="external free" href="ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/epica_domec/edc-co2-650k-390k.xls">ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/epica_domec/edc-co2-650k-390k.xls</a></li></ul></li></ol>