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[rjm]

http://www.theburningplatform.com/?p=24633

[rjm]

Tom Murphy writes a brilliant blog called "Do the Math"  in which he applies math and physics to help us understand what is and is not possible. 

The 2 main challenges for alternate energy are density and scale. In this article Tom addresses the challenge of storing energy at the scale necessary to maintain our current lifestyle.

A must read in my opinion.

http://physics.ucsd.edu/do-the-math/2011/11/pump-up-the-storage/