The bell shaped Hubbert curve is commonly observed when a non renewable, or slowly renewable, resource is exploited in a free market. But what is the origin of the curve? Ugo Bardi and Alessandro Lavacchi have recently published a simple "mind sized" model of the Hubbert behavior in "Energies" . Fat cows and lean cows are not included in the equations of the model, but come as a logical consequence of it.

(Note: I made the figure above using two cow images that I had downloaded from the internet long ago. If someone owns these images, please alert me or the editors. We'll be happy to give due credit or to remove the images if so requested.)

Cutler Cleveland of Boston University has reported that the EROI of oil and gas extraction in the U.S. has decreased from 100:1 in the 1930’s to 30:1 in the 1970’s to roughly 11:1 as of 2000 (Figure 1). But beyond the fact that society receives currently around 11 barrels of oil for every 1 barrel that it spends getting that oil, What does this mean?

Figure 1. Plot of three estimations of EROI for U.S. oil and gas.

In the wake of the recent interview with Jay Hanson posted at The Oil Drum, there was some discussion of Hubbert's role in the Technocracy movement.

I hadn't been aware that Hubbert was a Technocrat (or that the technocrats were an organised grouping, for that matter), so in this post I'll explore the Technocracy movement and Hubbert's role in it.

The knowledge essential to competent intellectual leadership in this situation is preeminently geological - a knowledge of the earth's mineral and energy resources. The importance of any science, socially, is its effect on what people think and what they do. It is time earth scientists again become a major force in how people think rather than how they live. - M King Hubbert

An update on the latest production numbers from the EIA along with graphs/charts of different oil production forecasts. 

World oil production (EIA Monthly) for crude oil + NGL. The median forecast is calculated from 14 models that are predicting a peak before 2020 (Bakhtiari, Smith, Staniford, Loglets, Shock model, GBM, ASPO-[70,58,45], Robelius Low/High, HSM). 95% of the predictions  sees a production peak between 2008 and 2010 at 77.5 - 85.0 mbpd (The 95% forecast variability area in yellow is computed using a bootstrap technique). Click to Enlarge.