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Decades ago when the most accessible reserves were drilled, an oil company might produce 100 barrels of oil or more for each barrel’s worth of energy invested.

Liability for any content uploaded, submitted, or posted is the sole responsibility of the person(s) who submitted it.

For fossil energy generally, the trend is downward despite technological advances in exploration and drilling. Some studies suggest that corn-derived ethanol actually has a negative net energy ratio—that is, more energy than a gallon of ethanol can deliver is used to produce a gallon of ethanol.

Sugarcane-based ethanol has a superior net energy ratio, but it is still low compared to fossil fuels.

The energy needed to mine the bauxite for the aluminum frame?

The energy needed to manufacture the heavy equipment that did the mining?

A society that depends on inexpensive energy to maintain a high standard of living and constant growth faces a predicament—it cannot maintain itself over the long run without high net energy fuels.

Oil, natural gas, and coal have provided a huge, high-quality energy subsidy to the modern world.

That subsidy, which has enabled human population and wealth to grow exponentially, is based on finite resources and cannot continue indefinitely.

Renewable energy sources, excluding hydropower, are generally more diffuse and have lower net energy ratios than fossil fuels.

For any potential energy resource, the fundamentals are the same.

How much energy is available after subtracting the energy costs to extract, process, and deliver the resource?

Any produced energy resource can be analyzed for its net energy ratio, although the process raises a difficult question: What are the boundaries of consideration?

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