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

Declining oil field productivity has brought the average net energy ratio for conventional oil down to approximately 20:1 globally, with more remote or hard-to-refine oil significantly worse.

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.

Suddenly she noticed a mature guy sitting in tall grass and gazing at her with a hostile glance.

She tried to run away, but her legs would not move.

Experts who study this use the terms “net energy ratio” or “energy returned on energy invested” (EROEI).

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.

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