To answer the original question, you have to cook a study pretty hard to show any energy gains with ethanol from corn (still ignoring aquifer and pollution issues). Ethanol subsidies are welfare for farmers, and I used to think it made more sense than paying farmers to not grow anything, but I'm not so sure now.
As for Eric's question, the correct replacement is a mix of sources. Some solar (more in certain reasons of the country), some wind (more here in the windy parts of the country), lots more nuclear and clean coal for baseline, we'll still be stuck with gas for peak loads or making up shortfalls for lack of sun or lack of wind. If we power the grid with these (especially nuke) we have enough oil to make plastic and run our cars and antique tractors for a long, long, time.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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