Dr Roy Spencer explains about the icy coldness now gripping parts iof Canada and US: "For as long as we have had weather records (extending back into the 1800s), lobes of cold air rotating generally from west to east around the polar vortex sometimes extend down into the U.S. causing wild winter weather and general unpleasantness.....We used to call this process 'weather'. Now it’s called 'climate change'”.