I clicked on this video because I thought it was going to be about global warming and rising water but it isn't. It's about the movement of the arctic circle and about erosion. Apart from "because the earth wobbles on it's axis" it is not explained in much detail. Why is it moving north and not south? Is the movement cyclical as seems to be implied?  <br>According to past hand wringing envirophobics, all the coastal cities in the world should be under water by now. The last I checked there is no sign of that.