here's arctic temperature 1920 to 2017

there seems to have been a trough from about 1960 to 1980, and now we're back to the temperatures that prevailed around 1930 or 1940
Fluctuations appear to have been larger in the old days
my bad, 2017here's arctic temperature 1920 to 1917
This is an inverse (ill-posed) problem.
That was by the year 2100. It is ludicrous to imagine cars running on gas at the end of the century, so that sounds about right.