[al_c]

Under water volcano?

[DejaJude]

There is an underwater volcano by New Zealand.

[oldasrocks]

Since we seem to be out of virgins would a few thousand Climate change kooks suffice? Drop them in from 30,000 ft. They would cool quickly at that altitude, hit the water and cool it off.

[Mogger]

4 degrees above average means in the past, to get an "average" number, there were numbers above and below the "average".

It looks like this is one of the higher numbers.