It's these sensationalistic articles that fuel discord over "science", which Chris Mooney is not, and those who want to believe all is false. Chris is a journalist, with a degree in English. He writes well, but, he has a clear agenda as indicated by his  book "The Republican War on Science" and other writings.
In his article at the beginning, "The single glacier alone contains 1.7 feet of potential global sea level rise", certainly written to excite the senses. His disclaimer at the end, "The immediate loss of ice from the shelf doesn’t raise sea level because that ice was already afloat" makes one concerned with science wonder how long it might be until the ENTIRE glacier would become seawater. Indeed, would it?
Perhaps it might simply form a lake?
But then, that would constitute a scientific look at things rather than sensationalistic journalism. Of course, if Chris chose that as a career he may need a day job to live on since the market for actual science writings is somewhat small.