Pittsburgh Post-Gazette: The great ice sheet of West Antarctica has begun sliding into what scientists believe is an irreversible collapse. It will take a century, but once glaciers that took tens of thousands of years to form are gone, the absence will result in a sea level rise in the Northern Hemisphere of at least 10 feet.
If this were the only scenario to worry about, it would be more than enough to qualify as a catastrophe. Unfortunately, West Antarctica isn't the only ice formation that may disappear from the bottom...