I've heard many of his other lectures.  And he's especially good at answering Q&A questions.  Happer gives very broad analysis, as good as it gets, especially in describing the temperature effects occurring at various levels in the atmosphere.   And another skeptical scientist, recently rising to become popular -- is Greg Wrightstone.  Wrightstone uses very understandable charts to support his talks. 

Its very IRONIC when scientists who were formerly big environmentalists or big liberals are turning against the adamant warmists (alarmists).  And there's quite a few of the turncoats, pointing out: 

• warming is being grossly overstated,
• its not rising to catastrophic levels, 
• CO2 is beneficial to mankind,
• historically temps have been way higher than even the highest of warmist models predictions.   

Michael Moore is a big liberal, Steven Koonin worked for Obama, Michael Schellenberger was a big environmentalist named a Time Magazine "Hero of the Environment."  These three are now "turncoats" becoming very critical of the warming activists, and they are recent additions to that list. From earlier years the turncoats included Patrick Moore, Alan Carlin, Nobel prize winner Dr Ivar Giaever, and James Lovelock, the environmentalist founder of Gaia theory.

Are you familiar with any of these guys??

Here's a 53 min video of Greg Wrightstone well known for his clear style.   Enjoy  Tom