It is NOT caused by humans! It’s an extension of the last glaciation. That’s all it is. Nothing more complicated than that.Gforce, the point I made was that it is difficult to predict with exact certainty how things will occur as we experience climate change. None of us were here during the event you listed, and past climate changes occurred for different reasons. The climate change of today is caused by humans - for the first time. And that makes it different - something we have not seen.