In this post, in which I mentioned ‘renewable’ and ‘sustainable’ in the same breath, I claimed that few people really understood what ‘sustainable’ means. So what actually does the word mean?
That which can be sustained? Something…..a process, a thing…..which can be carried on or last for… how long? A short time? A long time? Indefinitely? There are all sorts of fancy definitions, such as the one from the famous Brundtland Report in 1987, which talked about ‘sustainable development’.
In searching for definitions I found this site. It’s extremely comprehensive and I think it’s one of the best I’ve seen on what is popularly known as the ‘sustainability crisis’. This extract is from the glossary which defines ‘sustainability’ :
We’re going to define sustainability quite differently from normal definitions because the most popular definition in the world, the Brundtland definition of so called “sustainable development,” is flawed. It’s so flawed it should be tossed on the rubbish heap of history’s biggest catastrophic mistakes.
First we’ll give you our definition, followed by a look at why “sustainable development” is not just flawed. It was designed to deliberately lead problem solvers astray, because guess who “development” benefits most, even more than developing nations? Why large for-profit corporations, of course.
So here’s their definition. Short and sweet and simple to understand :
Sustainability is the ability to continue a defined behavior indefinitely.
Indefinitely? How long is that? Until the sun burns out and everything on earth turns into a charred mass? I don’t think we need to go quite that far. Upright-walking humans have been around for about 4.5 million years. That’s the age of the oldest-known skeleton that has been found anyway. Noted biologist Edward O. Wilson, in one of his books, gives the average age of a species as around 5 million years. So we might have another half a million years to go. I reckon that’s enough to be going on with.
So what can be sustainable? Can things be sustainable? I’ve seen a newspaper article in which a couple claimed they’d bought a ‘more’ sustainable refrigerator. (I’ve highlighted that word ‘more’ because I want to go into that later). Refrigerators can’t be sustainable. Apart from the fact that an individual fridge will break down eventually, they’re part of a bigger system and that’s what has to be sustainable (did they consider whether the material resources and energy used to make the fridge were themselves sustainable?). Can a person be sustainable? I’ve seen people say they’re trying to be self-sustainable. Again no, because people are part of a bigger system which they depend on and can’t be sustainable as individuals unless that system itself is sustainable (what they really mean is self-sufficient). So what does sustainability refer to? This is the definition we learned in our permaculture design course :
A system is sustainable if it produces more energy than it consumes, with at least enough energy left over to maintain and reproduce itself indefinitely.
This is getting closer to the mark, especially because it uses the concept of energy in the definition and because all life on earth is defined by energy transfer between living things and their environment. And it refers to systems. Only systems can be sustainable, not individual things. A system can’t be sustainable if any process in that system isn’t sustainable, i.e. can’t be carried on indefinitely. There’s that word ‘indefinitely’ again. I think we might just opt for ‘a very long time’, but I’ll continue to use indefinitely because it’s easier to type.
So now we have two things to consider: a system and a time scale.
A system is a collection of components which are interacting, interconnected and interdependent, so in order to assess the sustainability of a system all the elements in the system and their interconnections to other systems need to be considered. If just one of those components is a part or a process that can’t be continued indefinitely, the entire system can’t be sustainable. The ultimate system, as far as humans are concerned is the biosphere…..the living earth. It’s a hierarchy of systems within systems, within systems, within systems. We don’t need to consider anything larger, like the solar system or the universe, just the earth will do.
So onto that word ‘more’ and why it irks me so much in this context. Either a system is sustainable or it isn’t. There are no degrees of sustainability. That which is sustainable persists; that which isn’t, doesn’t.
I can’t remember how many times I’ve seen or heard the words ‘more’ sustainable. There is no such thing as ‘more’ sustainable, just as there is no such thing as ‘more’ dead. There are no degrees of deadness. Either a thing is dead (not alive) or it isn’t. It’s a yes/no thing, an on/off thing, or if you’re into digital stuff, a 0/1 thing.
When I was Googling sustainable, I found dozens of sites claiming “10 ways (insert any number you prefer here) you can be more sustainable”, and so on. Without a thorough understanding of the concept we have no hope of planning a future that is truly sustainable.
The other phrase that shows that most people have little understanding of the concept of sustainability is ‘sustainable growth’, although I’m not seeing so much of that now. It’s been pointed out so many times that the earth is finite and that nothing can grow forever in a finite system, that people are catching on to that one.
So when you see something described as sustainable, think it right through. Look for all the connections it has to the entire system of which it’s a part and if one of those connections is unsustainable, then the whole system is also unsustainable.
This post wasn’t easy to write, because sustainability is a concept that few people think about and is therefore difficult to get across to the generally uninterested layperson. So I want to thank Bernie, who is a regular reader, for his pre-publication input and comments. Bernie’s blog is here.
I use a very strict definition of sustainability. It reads something like this: “Sustainability is the ability of a species to survive in perpetuity without damaging the planetary ecosystem in the process.” This principle applies only to a species’ own actions, rather than uncontrollable external forces like Milankovitch cycles, asteroid impacts, plate tectonics, etc.
Paul talks about carrying capacity and overshoot, then goes on to ask, “what is a sustainable population level?” He uses three methods of assessment:
- the ecological footprint, in which he comes up with a figure of 4 billion people.
- the thermodynamic assessment—a population of about 1 billion.
- the population density assessment—about 35 million people.
There is a fourth assessment—the ecological assessment, in which he quotes the work of American marine biologist Dr Charles Fowler. Fowler did three assessments based on different approaches and came up with figures:
1) 35 million, 2) 10 million, 3) 7 million. Quite a difference!
My own view is this, formed after much reading and thinking:
Humans lived sustainably within the constraints of the biosphere for over 4 million years. Those constraints apply to all living things and include food availability, predation and disease. As hunter gatherers, humans must have lived sustainably. If they hadn’t, they would have gone extinct and we, their descendants, wouldn’t be here now discussing it. Of course, human populations would have risen and fallen over that time, but on the whole didn’t grow appreciably.
Then, some 12,000 years ago, agriculture was adopted. Before this, hunter-gatherer societies had been in approximate equilibrium, relying on photosynthetic energy to supply plant and animal foods and fuels for cooking and heating and barely altering the Earth’s surface. Agriculture was probably an unavoidable consequence of a species with a large brain capable of observing and thinking, an upright habit thus freeing the forelimbs for holding tools, plus opposable thumbs, making holding things even easier. The main thing about agriculture is that it produces more food than would be available naturally and that allows more people to survive, so population increases. More people means more food has to be grown and more food means more people. We have been on that positive feedback treadmill ever since. Now, we could have gotten off that treadmill (and still could), if we had realised the problem and done something to control our numbers. But we didn’t and now there are way too many of us and our activities are destroying the biosphere on which all life depends. It is too late to go back. Finding and using fossil fuels to grow even more food just exacerbated the problem and has produced huge increases in population over a very short time.
Without food supply constraints and self-control of numbers, a crash is inevitable. Whether you call it a crash or an ecological correction, it is all the same. Nature (our name for the biosphere system) makes the rules, not any one species.
So my view is this: any form of food-growing, without self-control of numbers will prove to be unsustainable and that applies even to permaculture, which is still agriculture, although one of the permaculture principles, ‘apply self-regulation and accept feedback’, covers this nicely, so long as those who practise permaculture adhere to it.
It’s also my view (and the view of others I’ve read), that hunter-gathering was and is, the only sustainable way of living for humans, simply because that is the evolved way for all other species and we are no different; just another species of large mammal, living in a system in which the emergent properties of the system set and maintain the behaviour of that system. Our large and complex brain has enabled us to get where we are today, but it’s more than likely it will ultimately and quite literally, be the death of us.