Plants and animals adapt to their world so when the climate changes they either change, move, or die. For plants and animals forced to tough out harsh winter weather, the coverlet of snow that blankets the north country is a refuge, a place beneath-the-snow that gives an essential respite from biting winds and subzero temperatures. But in a warming world, winter and spring snow cover in the Northern Hemisphere is in decline, putting at risk many plants and animals that depend on the time beneath the snow to survive the chill of winter. Snow, in this case, is like a warm blanket.