This is probably a little off topic, but it can all melt in a few hours with one decent sized asteroid. This happened before in Greenland. [1] Geologists have confirmed the impact that melted all the ice due to the existence of billions of microscopic diamonds in the crater. My question is, are we monitoring enough of space to know if a big rock is coming and what will people do?
[1] - https://www.sciencemag.org/news/2018/11/massive-crater-under...