I find it fascinating to keep a watching brief on the North Atlantic Current. In the whole climate change debate about global warming it is the one thing that seems to have the ability to suddenly precipitate the planet in the exact opposite direction into an [url=http://www.rense.com/MexicoAlreadyDead.html]ice age in the northern hemisphere.[/url]
This has a brilliant map in the middle of global thermohaline circulation viewed from a south pole angle.
There is a summary article first then a whole lot of diagrams then a more scientific article following.