Transcript for scene 17 of the video " Energy Forever - 2 Fusion and Biofuels" by Rolf Witzsche - Ice Age Ahead not Global Warming  

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Nuclear-fusion power limited by lithium

If nuclear-fusion power should miraculously become a practical possibility, its future would be limited by lithium being inherently a finite resource that is also required for numerous other applications. At the current production rates to meet the supply for numerous applications, the known worldwide resource of lithium will likely be depleted in roughly 400 years. 

In order to remove the needed lithium from seawater, for one tonne of fusion fuel that would produce 1 Gigawatt-year of energy under the most ideal circumstances, the processing of more than 10 million tonnes of seawater would be required. On the practical scale, this reads: Impossible!

 

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Published by Cygni Communications Ltd. North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F. Witzsche