The article uses a lot of numbers throughout. The reporter used numbers to explain how much ice has melted in a period of time. The reporter also uses dates and ages to discuss the history of occurances like this one.
The reporter did a good job of keeping the numbers readable, and the reader is not overwhelmed.
Many of the numbers are in direct quotes, but they are still clear and easy to read, so the reporter didn't have to do much number-crunching. Sources include a couple glaciologists, a climate scientist, a chemical analysis, and a science journal.