Last summer NASA reported on the unprecedented Greenland meltdown
Satellites See Unprecedented Greenland Ice Sheet Surface Melt
“Ice cores from Summit show that melting events of this type occur about once every 150 years on average. With the last one happening in 1889, this event is right on time,” says Lora Koenig, a Goddard glaciologist and a member of the research team analyzing the satellite data.
The unprecedented event occurs once every 150 years, like clockwork. So the Washington Post did some brilliant analysis and determined that the frequency is increasing, based on the fact that there has been no change in frequency.
Bottom line: A major surface ice sheet melting event occurred in Greenland coupled with highly unusual temperatures. A similar event occurred in 1889 and, thus, links to manmade climate change are not yet conclusive. On the other hand, a pattern of pronounced warming in the Arctic in recent decades and other indicators such as melting sea ice, glacier melt, etc. suggest manmade climate change increased the likelihood of an event of this magnitude.