A glacier in Antarctica, the Pine Island Glacier, has a large crack in it, and is apparently just about ready to snap off a chuck of ice 300 square miles in size. In case you wondered, no, this is not the largest chuck of ice to break of Antarctica in recent years.
There are two versions of regarding this upcoming event.
1. just part of natural cycles, don't sweat it.
2. Nope, it's not part of natural cyccles, because scientists have studied the underside of the glacier, and have determined that it is being eaten away by seawater which has warmed in recent years. As a result, the glacier is now moving seaward at a speed of 4 kilometers per year- twice as fast as it was moving a few years ago. This is not an isolated event, this is one event inside a trend.
They call it Global warming- the first word is global. It's not just warming at the north pole, with the result that the polar sea is expected to be ice free in summer within 20 years. It's also warming at the other end of the planet. If Antarctica were to completely melt, there would be enough ice changed into seawater to raise sea level by some 200 feet. That could take a couple centuries- but in the end, we are talking about the abandonment of every major coastal city on our planet.
I'm not trying to alarm you, just trying to educate you.