One man's "curiously thrilling joyride" of travelogue, history, and climatology, across a planet on the brink of cataclysmic transformation (Donovan Hohn). As the planet warms, winter is shrinking. In the last fifty years, the Northern Hemisphere lost a million square miles of spring snowpack and in the US alone, snow cover has been reduced by 15-30%. On average, winter has shrunk by a month in most northern latitudes. In this...