climate science denialism
During the northern Winter, much of the Arctic is covered with sea ice. Some of this ice melts during the summer, then it regrows. Over recent years, the amount of ice loss in the summer has tended to increase, almost every year, year after year. In 2012 the loss of sea ice was extreme, falling for much of the melting and re-freezing cycle below any year seen before.
The year 2013 was also extreme, with more ice melting away in the summer than almost every previous year, but not to the extent seen in 2012.
Climate science denialist used this fact to make up a story. In this case, the word…
Here's a presentation by Michael Mann that I'm sure you will enjoy: