next time someone falsely claims the Arctic has not been so warm in millions of years, show them some climate reconstructions from ice core studies

References:

Alley, R.B. 2000  “The Younger Dryas cold interval as viewed from central Greenland”. Quaternary Science Reviews 19:213-226.

 

Kobashi, T., J. P. Severinghaus, and K. Kawamura (2008a) “Argon and nitrogen isotopes of trapped air in the GISP2 ice core during the Holocene epoch (0–11,600 B.P.): Methodology and implications for gas loss processes”. Geochim. Cosmochim. Acta. 72, 4675– 4686, doi:10.1016/j.gca.2008.07.006.

McKay, N., Kaufman, D.  “An extended Arctic proxy temperature database for the past 2,000 years”. Scientific Data 1. 140026 (2014). https://doi.org/10.1038/sdata.2014.26