Peak Water: Are we Running out of a Critical Resource?

"Peak Water" is an idea that has been going in parallel with that of "Peak Oil." Both assume that the production of limited resources, fossil fuels and fossil water, will follow a "bell shaped" curve. The production peak of liquid fuels may have been passed during the past few years. About "peak water" the situation is less clear, but the data indicate depletion problems in several areas of the world. Above, you see the historical and predicted water production from the Texas section of the Ogallala Aquifer. The data approximately follow a "Bell Shaped" (Hubbert) curve, typical of the depletion of non-renewable resources. In this case, the peak seems to have arrived in the late 1990. 

Freshwater is a fundamental resource in our world, even more than crude oil. Without freshwater, it would be impossible to maintain the current agricultural production that manages to feed nearly 8 billion human beings. Most of the world's agriculture, nowadays, is based on irrigation. It means that production depends on water that has been stored somewhere, naturally or artificially. And once you start depending on a limited stock of resources, you face a problem. Even though your resource may be renewable, if you exploit it faster than it renews itself, you will eventually run out of it. It is the phenomenon called "overexploitation"

There lies a truly nasty problem that we may be facing in the near future. A lot of water used for irrigation nowadays is "fossil water." It means it has been stored underground by natural processes that may have been active only in the ancient past or that may be very slow, sometimes of the order of thousands or even hundreds of thousands of years. Underground water deposits are called "aquifers." Some are fast replenished by natural phenomena, but in most cases, the rate of water withdrawal is much faster than that of the natural flow into the aquifer. That's a recipe for disaster.

A classic case of an agricultural region that ran out of fossil water is that of Saudi Arabia. Starting with the 1980s, Saudi Arabian farmers started extracting water that had been lying underground for hundreds of thousands of years, from a time when the Arabian peninsula was green. That was true fossil water in the sense that the replenishment rate of the aquifers was practically zero. The result was a boom in agricultural production that quickly peaked in 1990 following an evident bell-shaped curve. The curve had a second cycle during the 2010s, but that changed little to the situation. Right now, Saudi Arabia's agricultural production is reduced to practically zero and all the food must be imported.

 

 

Saudi Arabia's freshwater production was a classic case of a "Hubbert cycle." That is, water production followed the same kind of "bell-shaped" curve observed for crude oil and other mineral resources. The "Hubbert Theory" (the one that generated the concept of "Peak Oil") is far from being perfect, but it is true that in most cases oil production cycles generate bell-shaped curves. 

 

With aquifers, the core of the question is the same: you exploit a limited resource, you make a profit, you invest part of it in more exploitation. And that leads to depletion. The result is expected to be the same kind of curve. 

It doesn't matter that, in most cases, aquifers are partially replenished by natural phenomena. The curve will be the same, although it will not go to zero at the end of the cycle, but will return to the natural groundwater recharge rate. (source)

 But that may be an optimistic estimate: with aquifers, there is always the issue of subsidence. It means that once you remove the water from porous rock, the rock becomes more compact and it won't be filled again with water. It happens also with oil wells, but in that case, you don't care: it is known that oil is a one-time resource. Some aquifers may be in the same category, and may be gone forever after that they have been emptied. As an additional effect of subsidence, your home may sink into a hole in the ground. (image: subsidence in Jakarta).

So, it is perfectly possible to run out of water, even though water is theoretically a renewable resource. During the first millennium CE, an entire civilization, that of the Garamantes of central Sahara, disappeared when their supply of fossil water ran out.

So, how do we stand today? Overall, one would tend to say that the situation is not so good (to say the least). Most of the aquifers in use are being overexploited. The table below, from Wikipedia, is impressive (again, to say the least). 

 

If we continue in this way, it is unavoidable that sooner or later humans will run out of freshwater. It will be"peak water," but when could it happen, exactly? 

The problem with freshwater is that we don't have the same wealth of data for water resources and consumption that we have for crude oil. There exist a large number of aquifers, most of them are exploited only locally and it is difficult to obtain reliable data on what is being done in all the regions of the world. Nevertheless, we have some rough estimates: the total amount of freshwater accessible to humans is estimated as some 200,000 km3. The total consumption of freshwater worldwide is estimated at around 1,000 km3 per year. 

That these estimates are such round numbers tells us something about the uncertainty involved. But we can still say that aquifers contain huge amounts of water, about one thousand times more than the estimated volume of the world reserves of crude oil (about 200 km3). Even just the Ogallala aquifer in the central US is larger, estimated to have contained some 3,600 km3 of water before pumping started, in the 1950s. Then, we also consume huge amounts of water. We can compare again with crude oil, and we find that oil consumption (about 4 km3/year) is again dwarfed by water consumption that turns out to be about 250 times larger. 

Unfortunately, these data are not enough for an estimate of when peak water could occur. Not only there are too many uncertainties involved, but the main point is that water is mostly a local resource, unlike oil, which is global. It means that the depletion cycle is spaced differently in different regions, depending on the rate of consumption to reserves. So, the fact that Saudi Arabia mostly ran out of water during the past decade had no significant effect on the world's agricultural production. But if a truly major agricultural region, such as the Central Plains in the US, were to run out of water, then the situation would quickly become dire for all the regions in the world that depend on food imported from the US.

So, what's happening in the US in terms of water production and consumption? The good news, here, is that consumption has been declining. That happened not because of water depletion, but because of the switch from coal to natural gas as the main energy source for electricity production. Natural gas plants are more efficient than coal-fired plants and the result is a reduced need for cooling water. (data below from USGS)

So, it is possible to reduce the consumption of water and that leaves plenty of it available for agriculture, but that doesn't solve the problem. As you see in the figure, the second largest sector of water consumption is irrigation and that sector has been declining, too. Nobody can say for sure if (or when) the wells of the Ogallala aquifer will run dry, bur these data are worrisome. 

Then, can we find new aquifers? Maybe, but even here the situation is not promising, to say the least. In 2013, the discovery of a new, large aquifer in Kenya was reported with much fanfare in the media. The aquifer was described as containing 250 billion cubic meters of water. Less than one-tenth of the Ogallala aquifer, but still a remarkable discovery.  Too bad that it was soon found that it was brackish water, not freshwater. So is life, you can't have everything, you know?

But we can desalinate brackish water, can't we? We can desalinate seawater, too. And you won't tell us that we will run out of seawater, will you? Sure we can. But that's not a panacea, either.

Agriculture is an economic activity that lives on very small profit margins. You increase the cost of some agricultural inputs and a lot of things change and farmers go in the red. Water for irrigation is often subsidized and farmers can't usually afford to pay it much more than $0.01 per cubic meter. In comparison, desalinated water may cost around one dollar per cubic meter, maybe a little less but not much. It is a factor of 10, at best. How much would an eggplant cultivated using desalinated water cost? More than most people would be able to afford.

As things stand, there is no way to use desalinated water in agriculture: we should go back to the dreams of "energy too cheap to meter" and that doesn't seem to be closer today than it was in the 1950s, when it was proposed. Besides, as long as our energy supply comes mainly from fossil fuels, using a substantial fraction of it to produce the huge amounts of freshwater needed for irrigation would be an environmental disaster.

That doesn't mean that desalinated water is a bad idea. Not at all and, in the future, it may cost much less than it costs right now. Just think of the possibility of producing freshwater using the excess energy that renewable energy plants generate at some moments during the day. It would be a smart way to store energy that otherwise would have to be wasted.  

Smart, yes, but problematic in many ways. One is that at present we are still far away from having excess energy production from renewable plants sufficient to produce the huge amounts of water needed in agriculture. The second - probably worse - is that desalinated water is mostly produced from seawater, near the seashore. But agriculture is mainly performed inland, so you would need a gigantic infrastructure to transport enormous amounts of water where it is needed. Again, not an impossible task, but a steep barrier to overcome, and the costs would be gigantic, too.

In the end, the problem is not so much having sufficient energy to desalinate water. It is that irrigated agriculture is just not a good idea. In most cases, it is a trap that leads to the destruction of the fertile soil, something that the ancient Sumerians already experimented around 2,200 BC. It seems that the Sumerians depleted the aquifers they had been using for about one thousand years and couldn't avoid the soil to become too salty to be cultivated. 

Are we facing the same destiny? Maybe. But there are many ways open for a kind of agriculture that's more respectful of the soil and that doesn't need so much water as the current methods do. It is to be seen if we can change fast enough to avoid having to adapt the hard way, that is rebuilding after collapse. In this field, as in many others, the Seneca Cliff is awaiting.

Saudi Arabia Goes the way of the Garamantes. Google Earth Confirms the Collapse of the Water Supply

 

In 2008, I noted the decline in Saudi Arabian water production and I published an article in "The Oil Drum" titled "Peak Water in Saudi Arabia." Using a simple version of the Hubbert model of resource depletion, I noted how the supply of "fossil water" had peaked in 1990 and had been declining ever since. This is the typical behavior of "fossil" resources: they tend to peak and then decline. It had already happened to the ancient Garamantes, inhabitants of central Sahara, who had developed sophisticated technologies of water extraction during the 1st millennium BC. That had allowed them to prosper for about one thousand years, but then depletion had its revenge and they vanished among the sand dunes. Something similar (but probably much faster) is going to happen in the Arabian peninsula. 

 

The old Hubbert model was developed to describe the cycle of extraction of crude oil. It may be oversimplified if you want to use it for detailed predictions. But, as a quick tool for understanding the situation of the production of a non renewable resource, it tells you a lot of what you need to know. That first stab of mine on water production in Saudi Arabia turned out to be correct. 

It is impressive how, today, you can use Google Earth to look at the situation "from above." You can see the collapse of the agricultural fields as depletion progresses. Here are the images of an irrigated area for a region East of Al Jubail, in Saudi Arabia,  26°48'29.60"N and  49° 8'47.58"E. 

Let's start with an image of the desert in 1984. There is absolutely nothing there:

One year later, 1985. Someone has started extracting water and irrigating the land. There are two active fields there. 

Below, you see an enlargement of the 1985 situation. Someone has built a road and you can see six irrigated areas, of which two are active. Each circle is almost exactly 1 km diameter. It is called "center pivot irrigation" -- there is a long arm that turns around the central pivot and irrigates the area.

Below, the situation in 1986 -- there are now 31 active circular fields. 

And now the area in 2002. There are now 46 active or partially active fields. Note the dark spots among the circular green areas. It is not clear what they are, could they be small ponds of brine? The water they are using probably has a high salinity and they have to dispose of it, somehow. 

 Below, the situation in 2015. The cultivated area is clearly declining. There are now only 17 active fields.

 

And, finally, the situation in 2020. It is gone. No green fields anymore. They simply ran out of water.

That doesn't mean that agriculture in Saudi Arabia is completely over. Scanning the desert using Google Earth, you can still find irrigated areas. Here is a place called Qariat al Olaya

There are several irrigated circles, but note the number of "ghost" fields, not irrigated anymore. It may be a seasonal effect, but it may well indicate big problems with water supply. 

Finally, some data about wheat production in Saudi Arabia, the most recent I could find (from "actualitix")

As you see, they had two peaks: the first one is the one I had already noted in my article on the "Oil Drum" of 2009. The second one was ca. 2005. As it often happens, when a resource starts declining, people tend to apply more capital to keep things going. It happens also with crude oil, the case of "shale oil" is a classic example. In Saudi Arabia, they succeeded in creating a second peak. But now, it seems to be the final decline. 

Just like the ancient Garamantes, the Saudi Arabians were able to overcome the aridity of their land by using fossil water. But when they ran out of it, it was time over for them. The Saudis still have crude oil and can import food despite not being able anymore to produce it. But oil is a fossil resource, subjected to depletion just like fossil water. And the destiny that befell the Garamantes is going to befall all those who depend on fossil resources. 

 

The Sixth Law of Stupidity: Why Humankind may be the Stupidest Species in the Whole Ecosystem

 

 Illustration by James Donnelly for the original 1976 paper by Carlo M. Cipolla "The Basic Laws of Human Stupidity" Recently, Ugo Bardi and Ilaria Perissi reviewed his work on the basis of modern Biophysical Economics arriving to validate and extend the laws. Not only, as Cipolla said, stupidity is common and dangerous among humans, but humans may be the stupidest species in the whole ecosystem!

 

I remember having met Carlo Maria Cipolla in Berkeley in the 1980s. At that time, I wasn't involved with biophysical studies, but I was already a fan of his work. His treatise on stupidity was truly a masterpiece of intelligence and humor. Then, his description of money forgers in Florence during the Middle Ages included also a mention of some of my remote ancestors, no doubt very enterprising people, actually too much! Cipolla was an incredibly brilliant writer and, in real life, he was charming, generous, and modest.

Cipolla's work on stupidity has been in my mind for a long time. His ideas on the matter were so simple and yet so deep. And he was expressing these deep concepts in a plain language that everyone could understand. The "third law," the basic one, is expressed as "A stupid person is a person who causes losses to another person or to a group of persons, while himself deriving no gain and even possibly incurring losses." 

So simple, and it happens all the time. We are surrounded by stupidity, embedded in stupidity, accomplices of stupidity, perpetrators of stupidity. It seems to be a sort of cosmic ether that permeates everything and, unlike the ether of physics, it really exists. But why is it so common?

Recently, we got together with my coworker Ilaria Perissi, and we started thinking about making a model of Cipolla's law. Ilaria has been modeling the production cycles of fisheries using the biophysical model called the "Lotka-Volterra" model and, together, we published an entire book, "The Empty Sea," on that subject starting from those studies. (as you can see in the picture, Ilaria is very proud of that book: her first book in English!).

As you probably know, the Lotka-Volterra model is supposed to describe the interaction of two populations: predators and prey. It is often called the "Foxes and Rabbits" model. But it is much more than that. It is a simple model that goes very deep into the concept of "potential dissipation" that dominates the functioning of complex systems in the real world. 

So, not surprising that the Lotka-Volterra model could give us some deep insight into Cipolla's intuition. According to our interpretation, stupidity occurs when the dissipation of an energy potential goes too fast: the result is what we call "overexploitation" in which people exploit a resource to the point of destroying it, and damage themselves in the process. Fortunately, we also found that these systems can adapt in the long run. In an evolutionary system, stupidity punishes itself, but it takes time. Unfortunately, we are still in the midst of what could be the greatest stupidity wave that the ecosystem ever saw in its nearly four billion years of existence.

Here is the introduction to our paper. You can read it on ArXiv (we are planning to publish it in a scientific journal soon). It is written according to the rules of formal scientific prose, but one of our purposes in writing it was to follow Cipolla's example and demonstrate that a scientific paper need not be incomprehensible and boring!

The 6^th Law of Stupidity: A Biophysical Interpretation of Carlo Cipolla’s Stupidity Laws

Ilaria Perissi and Ugo Bardi
Dipartimento di Chimica – Università di Firenze.
Polo Scientifico di Sesto Fiorentino, via della Lastruccia 3
50019 Sesto Fiorentino (Fi) - Italy

Abstract

Carlo Cipolla’s “stupidity quadrant” and his five laws of stupidity were proposed for the first time in 1976 [1]. Exposed in a humorous mood by the author, these concepts nevertheless describe very serious features of the interactions among human beings. Here, we propose a new interpretation of Cipolla’s ideas in a biophysical framework, using the well-known “predator-prey,” Lotka-Volterra model. We find that there is indeed a correspondence between Cipolla’s approach – based on economics – and biophysical economics. Based on this examination, we propose a “6^th law of stupidity,” additional to the five proposed by Cipolla. The law states that “humans are the stupidest species in the ecosystem"

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Introduction

In 1976, the economist and historian Carlo M. Cipolla (1922-2000) wrote an essay titled “The Basic Laws of Human Stupidity.” Initially, it was only a pamphlet circulated among friends [1], but later it was published as a book [2]. Written in a tongue-in-cheek style, Cipolla’s text analyzed human behavior using a simple semi-quantitative model in the form of two individuals (“agents”) interacting with each other in performing an economic transaction.

Cipolla reasoned in terms of the payoff of each transaction, arranging the possible outcomes as a quadrant divided into four subsectors. One of the two agents may gain something at the expense of the other, but it may also happen that both profit from the exchange. The worst possible situation is the one in which both lose something. The kind of agents who cause someone else’s loss while damaging also themselves in the process were labeled by Cipolla as “stupid people.”

From there, Cipolla went on defining the five “laws of stupidity” as 1) Always and inevitably everyone underestimates the number of stupid individuals in circulation. 2) The probability that a certain person will be stupid is independent of any other characteristic of that person. 3) A stupid person is a person who causes losses to another person or to a group of persons while himself deriving no gain and even possibly incurring losses, 4) Non-stupid people always underestimate the damaging power of stupid individuals, and 5) A stupid person is the most dangerous type of person.

Today, Carlo Cipolla may well be better known for his quadrant and the five laws, that he probably thought of as a joke, than for his academic papers. One of the reasons for this popularity is that these ideas ring true: they make sense according to our everyday experience. Indeed, Cipolla’s ideas have been examined, discussed, and modeled in various ways for instance in terms of game theory [3] and of agent-based modeling [4].

Here, we wish to take a fresh look at Cipolla’s theory using a biophysical approach. That is, we will frame Cipolla’s quadrant in terms of a complex system similar to biological ones. We’ll use the model known as the “Lotka-Volterra” (LV) one, also known as the “predator-prey” or “Foxes and Rabbits” model [5], [6]. Our examination leads us to propose a “6^th law of stupidity” that applies to the whole ecosystem and that has that “Humans are the stupidest species on Earth.”

 

Read the whole Paper on ArXiv