It is a sad fact, but it is likely that within my lifetime it will become possible to sail to the North Pole. I am 56.
Tragically it is also true that there is absolutely nothing that you or I can do about it.
In fact, even in the unlikely event that humanity en masse decided it wanted to prevent this liquefaction, there would be literally nothing we could do to stop it.
The carbon dioxide we have already put in the atmosphere will warm the Earth’s surface for a few decades yet even if we stopped all emissions right now.
The particular line of causation between carbon dioxide emissions and warming of the arctic is long, and difficult to pin down.
Similarly it is difficult to determine if a bull in a china shop broke a particular vase, or whether it was a shop helper trying to escape.
Nonetheless, in both cases the ultimate cause is undeniable.
What does the figure show?
The animation at the head of the page, stolen from NASA’s Earth Observatory, is particularly striking and clear.
The animation shows data from 1979 to this past November 2016 showing the extent of sea ice versus the month of year.
Initially the data is stable: each year is the same. But since the year 2000, we have seen reductions in the amount of sea ice which remains frozen over the summer.
In 2012, an additional one million square kilometres – four times the area of England Scotland and Wales combined – melted.
The summer of 2016 showed the second largest melt ever.
The animation highlights the fact that the Arctic has been so warm this autumn, that Sea Ice is forming at an unprecedentedly slow rate.
The Arctic Sea Ice extent for November 2016 is about one million square kilometres less than what we might expect it to be at this time of year.
The graph below lacks the drama of the animated version at the head of the article. But it shows some things more clearly.
This static graph shows that the minimum ice extent used to be stable at around 7 ± 1 million square kilometres. The minimum value in 2012 was around half that.
The animated graph at the head of the article highlights the fact that the autumn freeze (dotted blue circle) is slower than usual – something which is not clear in the static graph.
My concern is that if this winter’s freeze is ‘weak’, then the ice formed will be thin, and then next summer’s melt is likely to be especially strong.
And that raises a big question at the very heart of our culture.
When the North Pole becomes the North Pool, where will Santa live?