Why concentrate on the North Atlantic? Won't Antarctica grow jealous?
It's the only location in the world where we have an intersection of shipping lanes with icebergs. Greenland's Labrador Current takes icebergs north first and then to the south, where they cross the Great Circle route. In addition, the cold Labrador Current intersects with the warm Gulf Stream current, which creates fog in the summer and storms in the winter. With those two pressure systems we'll see 30- to 60-foot waves. It's very dangerous. There's sea ice as well, depending on the season. The sea ice often freezes around the iceberg, and when it's encapsulated in sea ice, it's not exposed to the warming elements and it's able to drift much farther south.