Gail Tverberg, What Would it Take to Get to a Steady State Economy?

“… If we want 7 billion people to be able to continue to live, we will need some basic level of energy supplies for these 7 billion people. If we assume that as a minimum, people today will need at least the 1820 level of energy consumption…, we will need total energy consumption of at least 22 gigajoules per capita. This would amount to about 7% of the current energy consumption of the United States. It would not be enough to perform what we now consider basic functions such as maintaining roads, electrical systems, water systems, and sewer systems, so would be a major step down for US residents.

“There seems to be a common belief that cutting down on personal transportation fuel would have a big impact on total energy consumption. In the US, gasoline amounts to about 44% of US oil consumption. If we eliminated all gasoline consumption (even that by police, ambulances, and sales people), it would only reduce US energy consumption (all types, not just oil) by 16%. On a worldwide basis, much less oil is used for personal transportation, so eliminating all oil for personal transportation would likely reduce world energy consumption by something like 10% to 12%.

“The only way a Steady State would make sense would be if there were some level of Steady State that humans could fall back to, instead of collapse. Unfortunately, it is hard to see a good place to fall back to. The only period where human population was relatively constant was in the period 1 CE to 800 CE, when frequent collapses kept populations down. It is difficult to see any point at which humans have not increased population, or increased resource use, if resources were available, except when frequent civilization collapse overwhelmed the system.”