Comment: Re:Aquaponics (Score 1) 592
Let H_t be the height of the tower from the bottom of the farm.
Let H_f be the height of the top of the farm from the bottom of the farm. (1.5 m in your case)
g = earth's gravity.
Note 1 kg of water = 1 liter of water.
Now, for every kg of water in the tower, (H_t - H_f) * g joules of energy are released. Each kg pulled up from the bottom of the tower uses up H_f * g joules of energy. So thus, every kg down can lift up (H_t/H_f - 1) kgs of water. So, if the tower is 15 meters tall, then you only need 1 kg to get 9 kg up. In your case, for example, if the tower is 15 m tall and you want 3000 kg/hour, you only need 300 liters of water in the tower to run it for an hour assuming your mechanical pumping system is 100% efficient (obvious it won't be, but it probably will be pretty close). The falling water can also run the air pump, solving that problem while you're at it. You can still have the electric system as a back up. Note that it is often much more windy at night than during the day so you might want a 24 hour storage system. This might get big, but if you are already building a huge tower for the wind turbine, it might not be all that bad.
Comment: Re:Ho Hum (Score 1) 181
Comment: Re:Where does the hydrogen come from? (Score 1) 105
Comment: Re:155mph isn't green using any fuel (Score 1) 105
Comment: Re:Ehrlich was right, just a little early. (Score 1) 522
The "simple physics" is not so simple when you have a sentient and innovative race in the picture. As the materials are depleted, we are finding increasing substitutes, for example, we instead of steel, we are making cars out of carbon. We are using aluminum instead of copper, etc. I eventually think we will end up with plastic wires. Plastic and carbon are a virtually inexhaustible resource (iron and steel is too), especially, with the increasing amount of work done on the electrolysis of carbon dioxide (I.E. the reversal of fossil fuel consumption) using renewable energy.
Simon's theory did not predict a constant decline of prices. Instead, he predicted that prices would rise. Then innovators would create radical new technologies and business models, causing prices to crash. Larger businesses continue to reduce prices little by little until they reach the price floor. Then prices rise again, repeating the cycle. You can think of these price increases as a bubble. For example, we are in an oil and energy conservation bubble. With renewable energy growth and falling prices in that sector, we will see an energy crash and glut.
I also believe that one day we will exhaust the resources of earth. I also predict we will be flying off to space the next day. I expect this to be very far in the future, but I do not know when.
Comment: Re:Ehrlich was right, just a little early. (Score 1) 522
Comment: Re:Ehrlich was right, just a little early. (Score 1) 522
Energy isn't getting any cheaper.
Stop. Fact ignored. Solar energy prices fall 9% per year continuously. The amount of energy available from the sun is extreme, you can power the consumption of a US suburban family's life off of the energy hitting their roof with 20% efficient (typical) solar. The issue is mainly a manufacturing/cost reduction issue.
There is nothing else. Fossil fuels were a one time windfall for humanity. We squandered it and there's nothing we can do about it.
Using gasification and synthesis technology, we can foresee many potential solutions, including the diverse schemes that have been proposed and demonstrated for the conversion of CO2 and H2O in to oil using solar energy.