The planet has been getting steadily warmer since the Little Ice Age (about 1350 to 1850).
If this is natural, this may be no more significant than declaring a day in June to be the warmest day since January.
There are news stories about retreating glaciers in Switzerland or melting ice in Greenland exposing human artifacts, plant remains, or even fragments of old settlements, that had been under the ice for centuries.
Has anybody ever really thought about that? I mean, completely through?