Here is my theory: That marijuana smoke is being mixed with the helium that these people are inhaling. http://wwwp.dailyclimate.org/tdc-newsroom/2010/03/global-cooling-is-bunk-draft-nasa-study-finds 

The data is only partial contradictory. The theory is GLOBAL warming. That is the entire earth. It does not mean that parts of the earth may not cool. Oh... and the oceans comprise more of the earths surface and being water are a larger heat sink than the land.