Which EROI do we need to collect berries?
The question of EROI – the energy return on energy invested – is raging nowadays, with some people insisting that a civilization cannot exist without an EROI of at least variously estimated values, at least 10 and higher (image on the right by Charles Hall). And that is said to mean we absolutely need sophisticated technologies, such as nuclear, in order to survive.
Yet, this morning I had been collecting berries in the wood with my wife and wondering: ‘what is the EROI of what we are doing?’ A reasonably good EROI, I am sure, enough for what our ancestors needed when they survived on hunting and gathering. All you have to do is to walk in the woods, find the berries and pick them up (and watch your step, you don’t want to fall into a thorn bush). If our hunter-gatherer ancestors used this method, and if we are here today – their descendants – it means it was an effective strategy for survival. Collecting what you can find is an ancient and tested strategy that goes under the name of “gleaning” and it has accompanied humankind for millennia. It is a good strategy just because it is so simple: no tools, no laws, no hierarchy. And it works.
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