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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.Where the boundaries are drawn affects the final net energy ratios.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.

The energy needed to construct the factory that produced the panel?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.Parody movies with a lot of porn to dazzle any dirty mind.Watch movie characters in amazing scenery while getting hard fucked and naked.

The energy needed to construct the factory that produced the panel?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.Parody movies with a lot of porn to dazzle any dirty mind.Watch movie characters in amazing scenery while getting hard fucked and naked.Renewable energy sources, excluding hydropower, are generally more diffuse and have lower net energy ratios than fossil fuels.