Following Climategate, when it became known that raw temperature data for CRU’s “HADCRU3" climate dataset had been destroyed, Phil Jones, CRU’s former director, said the data loss was not important -- because there were other independent climate datasets available.

But the emails reveal that at least three of the four datasets were not independent, that NASA GISS was not considered to be accurate, and that these quality issues were known to both top climate scientists and to the mainstream press.

via Pajamas Media » Climategate Stunner: NASA Heads Knew NASA Data Was Poor, Then Used Data from CRU.