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Saturday, October 24, 2015 12:15:37 AM
Ok! We'll use your research #'s for the water needs to produce the hydrogen and we'll go ahead and use the numbers at the higher end of the estimate (69 trillion gallons of water) which includes the thermoelectric needs as well. And we'll ignore the fact that the fuel cells' waste product is pure water, which would flow back into the environment.
"Webber’s analysis estimates that this amount of hydrogen would use about 19-69 trillion gallons of water annually as a feedstock for electrolytic production and as a coolant for thermoelectric power"
So, we have: 69 X10 to the 8th gal/yr
Now: A cubic kilometer of water equals about 264 billion gallons.
And The volume of all water on earth would be about 1,386 million cubic kilometers.
This means that:
1,386,000,000 cubic kilometers X
264,000,000,000 gallons/CK3 =
365,904 X 10 to the 14th power gallons of water
Therefore:
365,904 X 10 *14th gallons of water divided by
69 X 10 *8th gallons of water used/yr = 5,303 X 10 *6th yrs of use. Or in other words it would take 53,030,000,000 years to use up all the water on earth. That's 53 Billion years give or take. But hey, what's 30 million years among friends. Just for some perspective and an interesting environmental tidbit, the earth was in the Oligocene period, which just happened to be the first era of "global cooling" which set the stage for the water to be gathered together. Thus plants and animals began to flourish and the polar ice caps began to form.
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