NASA Debunks 2012 Mayan Apocalypse Claims??

Don Yeomans of the Jet Propulsion Laboratory is seen here attempting to debunk any theory of the 2012 Mayan apocalypse. He talks about Nibiru, solar storms, planetary alignments, pole shifts and the end of the Mayan calendar. What do you think of Mr. Yeomans explanations of all these theories? Are his answers plausible or just more of the same from NASA or should we say Never A Straight Answer?