Here's a book you must buy for Christmas. In a stunning reversal of logic, the warmies have put this guy on their side. I always had him on my side, mainly for promoting the Scientific Method, and dropping imaginary cannon balls.
Anyway, I'm throwing in the sea level from my favourite station. Sea level has made a big drop for this station. I have a 100% correlation to world temperatures. When this level drops, the world temperatures show a drop. And there is basic physics (a mechanism) here. No 'magic' needed.
See the backgrounder link to the right for an explanation on how the sea acts as a big thermometer.