Fox News: With record snowfalls in China and freezing cold blanketing the U.S., this winter has been a doozy for half the planet! Yet the other half is enduring unseasonable heat. What’s going on? A wave of frigid air spilled down over Europe and Russia from the Arctic in mid-December, creating a deadly cold snap. Blue indicates temperatures as low as -20 Centigrade. What happened to global warming? Mother Nature is in a very, very bad mood. Much of the Northern Hemisphere is in …