Had you actually read the article...
$1:
It is too early to say it is clearly global warming, Zwally said. Scientists don't like to attribute single events to global warming, but often say such events fit a pattern.
University of Colorado Prof. Konrad Steffen, who returned from Greenland Wednesday and has studied the Petermann Glacier in the past, said that what Box saw is not too different from what he saw in the 1990s: "The crack is not alarming... I would say it is normal."