Heard of "carbon sinks?" What about "mercury sinks?" - The Weather Guys - USATODAY.com

Perhaps you are familiar with the term, "carbon sink," which often comes up in climate change/global warming debates, particularly when discussing whether oceans and forests are a source for carbon in the atmosphere or a storehouse for carbon.

Well, this post has nothing to do with the global warming debate. In fact it is about cold spots -- cold spots that I'd like to call "mercury sinks." Reader Trent McCotter, who keeps a careful eye on our nation's high and lows feature*, brought these to my attention. These sinks are old limestone caves in northern Utah that collapsed in a huge bowl area at over 8000 feet, providing ideal radiational cooling conditions. McCotter expects that temperatures in the Sinks could drop to -25°F Monday morning.

Wide range of temperature every day in the U.S.--can someone explain again just how dangerous another 1 degree would be?