https://en.wikipedia.org/wiki/Jevons's_paradox
QuoteIn economics, Jevons's paradox sometimes the Jevons effect occurs when technological progress increases the efficiency with which a resource is used (reducing the amount necessary for any one use), but the rate of consumption of that resource rises because of increasing demand. Jevons's paradox is perhaps the most widely known paradox in environmental economics.
In the R. Mills energy economy to come, one hydrogen atom will produce 27 ev worth of energy. That reaction will remove that hydrogen atom forever from our world. A molecule of water will produce 54 electron volts.
Mills says that since fuel is free then conservation an efficiency is not important. Only ten percent of the energy produced by the SunCell is used. So every water molecule will produce 5 ev of power and 50 ev of waste heat.
The IEA estimates that, in 2013, total world energy consumption was 9,301 Mtoe, or 3.89 × 10e20 joules.
That comes to 2.4285712855e+39 ev.
So the amount of water molecules that will be consumed is on the order of 10e39.
The density of water is 1g/(cm3) so in 1 gallon of water ( about 3.785 Liters or 3785cm3) the mass of the water is, 3785g. 1 mole of 6.02x1023 molecules of water is equal has the mass in grams equal to the molecular weight or 18 grams per mole. so 3785 grams corresponds to about 1.265 x 10e26 molecules of water.
The water consumed will be 10e39/10e26 or 10e13 gallons of water.
or 378.54 cubic kilometers of water/year.
There is 1.332 billion cubic kilometers of water on the earth
Since water is free, we can assume that the water consumption by SunCell will rise to 1,332 cubic kilometers per year due to Jevons's paradox.
So we will have about million years of water to use before it all is gone.
But long before that water limit is reached, the amount of oxygen in the atmosphere will become dangerous.
How much atmospheric pressure can you and yours take? Venus, here we come...