I am a Climate Change (human caused) agnostic.

[Nederland]

462. You are truncating the data

If you look up the observed temperatures in Greenland for the last few years you'd see that your red line needs to go up much further than what you have shown. The temperature record at the GRIP drilling site (which is only 24km from where the ice cores you are referencing were drilled) looks like this:



Now, you can't simply tack on a new line that goes all the way up to -27.0. I know a lot of people would do that to try make you look really stupid, but I'm not one of them. I'm interested in the truth, which I hope you are too.

No, what you need to do is correct for the difference between the proxy data (coming from the ice cores) and the observed temperatures by comparing them at the same point in time. Doing this we see that around 1855 where the ice core data ends the temperature comes back as -28.5, but the actual observed comes in at -31.5 for the same period. So we have a ~3.0 degree difference. So we take the observed number in 2009 (-27.0) and subtract 3.0 to end up at 30.0 degrees for present day. That would make your chart look like this:



I believe this is a more accurate picture. You still might have a point, since you were a little vague on what you think the chart showed. I'll let people look at it and decide for themselves.