Below is a very good article on part of the story of Hansen and may explain how and why he has been bought off by Soros, though he is a "paid by your taxes" employee of NASA who should be trying to service you with the truth and not his own idealogy and big pocket money backers.
"For years, Hansen's group at GISS, as well as other leading climate scientists such as Mann and Briffa (creators of historical temperature reconstructions) have flaunted the rules of science by holding the details of their methodologies and algorithm's secret, making full scrutiny impossible. The best possible outcome of this incident will be if new pressure is brought to bear on these scientists to stop saying "trust me" and open their work to their peers for review. This is particularly important for activities such as Hansen's temperature data base at GISS. While measurement of temperature would seem straight forward, in actual fact the signal to noise ration is really low. Upward "adjustments" and fudge factors added by Hansen to the actual readings dwarf measured temperature increases, such that, for example, most reported warming in the US is actually from these adjustments, not measured increases.
In a week when Newsweek chose to argue that climate skeptics need to shut up, this incident actually proves why two sides are needed for a quality scientific debate. Hansen and his folks missed this Y2K bug because, as a man-made global warming cheerleader, he expected to see temperatures going up rapidly so he did not think to question the data. Mr. Hansen is world-famous, is a friend of luminaries like Al Gore, gets grants in quarter million dollar chunks from various global warming believers ( Soros). All his outlook and his incentives made him want the higher temperatures to be true. It took other people with different hypotheses about climate to see the recent temperature jump for what it was: An error."