- jmn5,
I believe it is common. Just in longer cycles than we are aware of. Ever hear about the Wolly Mammoth they found flash frozen with vegetation in its mouth? Now that is extreme. Have no idea what caused it but as I said, we are drawing closer to a major celestial event. What will happen, no one truly knows. I personally will not worry about it. But it is a piece of evidence that exists out there. It may have some correlation to the speed up of weather changes over the last 20 years.
I DO believe that global warming/climate change is happening with only the reason for it not exactly known.
The evidence is there, the shrinkage in such a short space of time of the ice caps is enough to suggest that something is going on that, natural or not, is uncommon.