I recall NASA predicting complete loss of arctic sea ice by 2013, and the navy predicting the same in 2016.
after reviewing his own new data, NASA climate scientist Jay Zwally said: "At this rate, the Arctic Ocean could be nearly ice-free at the end of summer by 2012, much faster than previous predictions."
Are you unable to see the difference?
One NASA climate scientist said "the Arctic Ocean could be nearly ice-free at the end of summer by 2012", not "NASA predicted complete loss of arctic sea ice by 2013".
No, I'm not, because, according to your point of view, even in this case is not NASA, but five random NASA guys (mainly from the Radar dept.) saying that "[Larsen B] will likely disintegrate completely in the next few years" and that "Larsen B will eventually break it apart completely, probably around the year 2020", so OP is right: NASA guys were wrong before, so NASA guys could be wrong again.
And by the way, that one NASA climate scientist is NASA's Chief Cryosphere Scientist.