St. Patrick, Snakes, and the Gulf Stream

http://www.txtwriter.com/Onscience/Articles/patsnakes.html

"Saint Patrick drove the snakes from Ireland. 'Charmed them into the sea, he did,' she would say," writer Dr. George Johnson recalls his mother's Irish tale.

Well, today we need St. Patrick back to drive the snake from the White House; by allowing runaway global warming to continue, there is a real possibility of shutting down the Gulf Stream for the first time in thousands of years with results like these:

"When the last glacial ice finally disappeared from Ireland 18,000 years ago, its land remained frozen several hundreds years longer because the warming waters of the Gulf Stream were blocked from reaching England and Ireland as they do today, leaving the Irish weather frigid (remember, Ireland has the same latitude as Hudson's Bay in North America)."

At what temperature does Guinness freeze?