a paper which I assumed, as one normally would, that the chart being presented comes from the paper he's citing. This took some effort to track down because it's not very clear from the video. Fig 3: Paper citation for the graph What I managed to make out is that the citation is for Grootes 1993 , a paper titled Comparison of oxygen isotope records from the GISP2 and GRIP Greenland ice cores , published in Nature, 366, pages 552-554. I went to the Nature website and purchased a copy of the paper expecting to find the chart Carter is presenting. It's not there. There is nothing resembling Carter's chart in this paper.  There is only brief mention of the Holocene in the paper, one in the abstract to say, "Greenland has been remarkably stable during the Holocene, but was extremely unstable for the period representing the rest of the core." We can follow this for a moment though.  GRIP and GISP2 are two separate ice cores drilled on the Greenland summit.  The locations for the two projects are less than 20 miles from each other (Fig 4).  Therefore, these two records of temperature are little more than a corroboration of each other. These are not two distinctly different temperature records. Fig 4:  GRIP and GISP2 locations . Any changes in the climate record need to have a mechanism for the change. Even natural warming or cooling occurs for a reason. In a local record, like GISP2, many of the