"The Arctic will retain its power to amaze for a long time. Yet it is now changing beyond the usual regional and annual variations in sea-ice formation, glacier melt and so forth. The Arctic is clearly melting. Its floating ice cap is shrinking and thinning and its glaciers are retreating. By the end of this century, maybe much sooner, there will be frequent Arctic summers with almost no sea...
Greenland Borehole Temperatures 8000 BC to 2000 AD
Graph reproduced by Dr. John Christy in Searching for Climate Change.
"Measured temperatures down through an ice sheet relate directly to past surface temperature changes. Here, we use the measurements from two deep boreholes on the Greenland Ice Sheet to reconstruct past temperatures. The GRIP ice core (72.6°N, 37.6°W) was successfully recovered in 1992, and the 3028.6-m-deep liquid-filled borehole with a diameter of 13 cm was left undisturbed. Temperatures were then measured down through the borehole in 1993, 1994, and 1995 (3, 4). We used the measurements from 1995, because there was no remaining evidence of disturbances from the drilling and the measurements were the most precise (65 mK)."
What seems like an extreme change in temperature in the short term, can actually appear to be quite minor when a longer timeline is presented. While this graph would only measure the temperatures for the region surrounding Greenland, it does demonstrates that it has been both hotter and colder prior to widespread industrialism and the advent of the automobile.
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