Transcript for scene 30 of the video " Floods and Ice Age - Part 2" by Rolf Witzsche  

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Freshwater can be drawn from the ocean

Freshwater can be drawn from the ocean by a process of deep ocean reverse osmosis desalination. On land, desalination plants use high pressure to force saltwater through a membrane that blocks the salt molecules and lets the freshwater pass. The energy cost is high, for producing fresh water with high pressure desalination. But if the membrane is placed 5,000 meters deep, the weight differential between salt water and fresh water, will produce enough pressure differential for the process to run by itself.

 

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