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93 comments on Are Subsidies to Oil Companies Ever Justified?

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markincalgary on April 23, 2007 - 6:57pm Permalink | Subthread | Parent | Comments top

"[...] except the tractors are able to perform much more work for considerably less input."

Input of what? Input of man-hours? Agreed. Input of fossil fuels? I'm not so sure. In terms of work done for fuel fed, both are probably pretty inefficient. A horse or ox does have the distinct advantage that much of its fuel can be obtained from marginal land. When not working they can get all of their fuel from marginal land.

Certainly, I'm very curious about the Food Energy Return On Food Energy Input (FEROFEI) with bio-diesel tractors compared to draft animal power sources. My guess is that it would depend on what you're doing and how you do it.

I've done some plowing and harrowing behind a team of horses and it is slow going, but not a bad way to spend a morning if the weather is nice as it usually is in spring and fall plowing seasons.

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eric blair on April 24, 2007 - 8:19pm Permalink | Subthread | Parent | Comments top

Input of fossil fuels? I'm not so sure. In terms of work done for fuel fed, both are probably pretty inefficient. A horse or ox does have the distinct advantage that much of its fuel can be obtained from marginal land. When not working they can get all of their fuel from marginal land.

In terms of photon->work oil from fossil fuels is least efficient. Photons->pv->...-> work can be better than photon->plant->seedoil->work. Photon->plant->animal->work the conversion of plant to animal energy is poor value.

Marginal land is still taxed. Somehow your animal powered vision has to fit the present economic system.

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