Last year scientists discovered that the huge ice sheet covering the western part of Antarctica had started to melt so much that there is likely nothing we can do at this point to reverse the melting.

Now, new research shows that the ice of eastern Antarctica is also melting.  Over the next century or two, the disappearance of all this ice, melting and flowing into the sea, could cause more than 20 feet of sea-level rise - enough to cover most of East Boston and Chelsea.