“ Actually the COP can be greater than 1 as it is Q/W. Efficiency cannot be greater than one as it is W/Q, the reciprocal of COP. (read full comment) ” 

Posted on August 11, 2008 at 11:42 AM EDT

“ Wrong End of the Problem Why do we keep trying to increase the supply and variety of fuel sources for personal cars? If we attacked the demand... (read full comment) ” 

Posted on December 21, 2006 at 11:36 AM EST