time-lapse sort of animation of satellite imagery of the sea ice and of the continent of Antarctica. And what you see are three shades of gray. This sort of lighter shade of gray is the sea ice, and these little bits and pieces here, these are titanic icebergs. This little fellow right here, he's not a very big iceberg compared to these other ones, but that guy there might be the size of the island of Sicily in the Mediterranean. It's like a little tiny bumblebee zipping around in a circle, happy to be in the warm waters as it's drifting north. I'd be happy to see Antarctica as a static, monolithic environment, a cold monolith of ice, sort of the way the people back in the past used to see it, but now our comfortable thought about Antarctica is over. Now we're seeing it as a living being that's dynamic, that's producing change, change that it's broadcasting to the rest of the world, possibly in response to what the world is broadcasting down to Antarctica. Certainly on a gut level it's going to be frightening to watch what happens to these babies once they get north. What environment would the men of Shackleton's expedition encounter if they returned in a next life? Shackleton, seen here, would finally make it to the Pole, a quest he had to abandon a mere 100 miles short of it. Would there be any ice left? Would he have to construct an artificial Antarctica