Tag Archives: existential risk

Climate Change: Extinction Rebellion and the Language of the Apocalypse (Part 2: A Real Extinction Threat?)

In my previous post, I started to look at the apocalyptic language used by the climate change activist group Extinction Rebellion (XR). I criticised two fact-checking entities, a fact-checking programme hosted by the BBC called More or Less and a fact-checking web site called Climate Feedback, for misrepresenting some of the statements made by one of the founders of XR.

Both of these entities discredited the co-founder of XR, Roger Hallam, through reframing his statements into something very difficult to defend; that is, they misrepresented him as saying that, if we continue on our current CO2 emission trajectory, the planet’s human carrying capacity will  fall from around 7.5 billion today to one billion by the end of the century. In reality, Roger said we “could” see a world with only one billion if we continue with a policy of ‘business as usual’ for fossil fuel.

The death of over six billion is something I would label as an ‘existential’ risk: the risk of a precipitous drop in the planet’s human population leading to the potential collapse of the political, economic and technological structures that come under the broad heading of ‘human civilisation’. So not everyone will die, but a lot will, and the minority that survive will live an impoverished lifestyle that negatively impacts on their well-being.

So what is needed to get us there? In the BBC Radio 4 programme More or Less, one potential trajectory to such a world was given by the presenter Tim Harford:

Extinction Rebellion provided links to articles and speeches by three scientists. None of them mentioned six billion deaths. One of them, a German atmospheric physicist called Hans Schellnhuber, did say that if we have had unlimited global warming, of eight degrees warming, may be the carrying capacity of the earth would go down to just one billion…..

….. But eight degrees of warming is very much a worst case scenario. It’s well above the range discussed in mainstream forecasts of global warming. In the last a hundred and fifty years, we’ve seen one degree of warming.

Before I tackle problems relating to the above statements, I would also like to point out that the programme makers don’t really do justice to Schellnhuber’s credentials. He is the founder of a leading climate research institute in Germany, the Potsdam Institute for Climate Impact Research (PIK), and has been a lead author for the Intergovernmental Panel on Climate Change‘s past assessment reports. He is also the climate change advisor to the European Union Commission,  the German Chancellor Angela Merkel and the Pope. Check out his Wikipedia page here.

Back to the problems. For a start, if the BBC were going to quote Schellnhuber, why didn’t they ring him up and ask his view on the existential risk posed by climate change? And why do they focus on eight degrees as being extremely unlikely, rather than whether existential risk is extremely unlikely? The claim by Roger Hallam was that an existential risk to humanity is perfectly possible. He makes no claims about the degrees of warming the earth may experience.

So what does Schellnhuber think the chances are of saving our civilisation from the negative impact of climate change? From a December 2018 interview.

First, from three minutes onwards:

Q: You just said about we are in a position where we can manage the situation. But on the flip side, what you just said, you are questioning whether civilisation is sustainable. That is a stark difference.

Schellnhuber: If we get it wrong, So if we do the wrong things — policy in economics and psychology, in science — then I think there is a very very big risk that we will just end our civilisation. The human species will survive somehow, but we will destroy almost everything we have built up over the last two thousand years. I’m pretty sure.

Q: What sort of time frame would you put on that kind of …?

Schellnhuber: Oh it can happen pretty soon, pretty quickly because you see, if a minor conflict in Syria is sending so many shock waves through migrants, for example, to Europe. So, it’s all about nonlinearity. It’s all about non-linearity stupid.

Then from nine minutes:

Giving up is not an option. Why? I’ll just give you an example. I don’t know, do you have children? If you would have a child. I have a ten years old boy. Let’s assume he has an accident. And the doctor says “OK we might save his life ,if we do this type of surgery, but there is only a five percent chance, otherwise he will die”.

Will you say, “no we don’t do it, we don’t go ahead with the surgery”? Of course you will do it. And so it’s the situation we have now. I think we have more than a five percent chance of succeeding. But it’s definitely less than 50% in my view.

What’s the option? If we have a final chance to save our culture and our civilisation. I’m just compelled to do it.

So Schellnhuber — a leading climate scientist and advisor to the Pope, Angela Merkel and the EU — thinks we have a less than 50% chance of avoiding an existential crisis brought on by climate change and that such a crisis could come quite quickly.

In conclusion, I don’t know if Tim Harford is being knowingly disingenuous in misrepresenting Roger Hallam’s statements and then misrepresenting the scientist that XR quotes; perhaps, rather, this is just sloppy investigative journalism. But the fact is one of world’s leading climate scientists absolutely supports Roger’s view on climate change risk. Surely that is a thing of interest that the programme should have wanted to explore?

Moreover, if we want to ask questions about existential risk, shouldn’t we approach academics who study existential risk? This is actually not a difficult thing to do since the UK is blessed by a number of university departments that study just such risk. Don’t the More or Less team at the BBC have access to this knowledge?

In my next post, I will look at one of those departments: Cambridge University’s Centre for the Study of Existential Risk (CSER) and some of the research they produce.

In the meantime, I will leave you with a full-length lecture given by Jochim Schellnhuber at Cambridge University in February 2019. It is a masterclass in the communication of current climate change research and I can highly recommend it.









Utopia, Dystopia, Uncertainty and Our Psychological Selves

I have just finished reading Dylan Evans’ book “The Utopia Experiment“, which chronicles the author’s doomed attempt to found a self-sufficient community in rural Scotland as a post-collapse prototype for others to learn from.

It is always interesting to find a hidden back story about one of the authors who sit on my book shelf–and boy does Evans have a bizarre back story. Evans is an LSE-trained philosopher and scholar of risk, robotics, artificial intelligence and evolutionary psychology (after many a wayward turn).  I already own his book “Risk Intelligence”, which deals with many of the issues I confront in this blog, particularly ‘decision-making under uncertainty’. Unknown to me, Evans’ interest in risk, combined with his own personal demons, had previously led to a decision to opt out of conventional society, which in turn led to a complete nervous breakdown.

Evans displays a compulsive personality: he pours himself into a particular endeavour for a year or two, then recoils from any further long-term commitment. To launch ‘Utopia’, he sacrifices everything: his house, his job, his relationships. To justify this, ‘Utopia’ becomes more than a mere experiment but rather a lifeboat being made ready for the collapse of civilisation. In a conversation with Oxford academic and scholar of existential risk Nick Bostrom, he is asked this question:

How likely do you think it is that something like the imaginary scenario you are acting out in Scotland might really come to pass in the next ten years?

Evans replies:

I thought a bit longer, and finally declared that I thought that the chance of such a thing happening within the next ten years was about 50 per cent. Nick looked shocked. Not even the most pessimistic scientists thought things were that bad….

….the precision that Nick had demanded of me forced me to own up to my error in a way that vagueness never would. It betrayed the extent to which what had started out in my mind as an exercise in collaborative fiction had already become an insurance policy against a global disaster that I was increasingly convinced was imminent.

Later he frames this decision as more psychological rather than intellectual. A predisposition toward depression coupled with a generalized angst at living within large corporate structures results in a rejection of his existing social and institutional ties. The irony here, as he later admits, is that for one so psychologically fragile discarding structure is about the worst thing he could have done mental health-wise.

Moreover, ever the contrarian, Evans comes to question his own beliefs more rigorously the more advanced the experiment becomes. Intellectually, his certainty is lost and without that comforting narrative ‘Utopia’ become less a personal lifeboat but more of a rip tide dragging him below the waves.

So are there any wider lessons here? I think there are many. First, as behavioural economics teaches us so well, humans and not what the economist Richard Thaler calls ‘Econs’; that is, emotionless calculating machines as opposed to humans. We can only perceive risk and uncertainty within an emotional framework. Humans have an optimism bias partly as an evolutionary means to advertise positive traits that allow us to mate and flourish but partly just to keep us sane. Examining the downside is painful and can lead to isolation, rejection and depression.

Yet perhaps there are those of us who can maintain contrarianism without falling apart. Evans documents how the participants in ‘Utopia’ rapidly progress from viewing the commune as an experiment to one of preparation for real collapse. They need a narrative to inoculate themselves from the outside world. Yet after a time, Evans starts to question all the collapse narratives that the commune volunteers espouse, falls into depression and is eventually replaced as leader by an early volunteer called Agric.

What Agric offers to the remaining volunteers is a narrative of certainty, which Evans could no longer offer. Further, this is a narrative that is immune to any counter-argument since it rests upon an irrefutable theory.

Part of the reason why Agric was so dismissive of any suggestion that civilisation might not be about to collapse was the fact that he had a powerful theory. He was in the grip of Malthus, like many before him. Malthus had shown that population growth must always outstrip food supply, right? He had proved it.

And earlier:

The idea that our civilisation might not only survive global warming but also continue to grow richer had appalled me, and this was perhaps why I had believed so ardently that it would collapse. I had wanted it to. Agric still did.

At this point it would be easy to laugh at the ‘Utopia’ pioneers, painting them as New Age fools. But not so fast. Evans’ story shows how hard it is to disentangle the dispassionate from the emotional when it comes to risk and uncertainty, particularly when it comes to tail risk. But this cuts both ways.

Let’s assign a 1% probability to collapse rather than Evans’ 50% and let’s push out the horizon to five decades rather than one. We are now entering the territory of intellectual respectability. The kind of probabilities that former Astronomer Royal Martin Rees sets out in his book “Our Final Century“.


Yet the vast majority of us are repelled at discussing such negative scenarios. Nick Bostrom points out that the academic literature is many times richer when it comes to publishing papers on dung beetles or Star Trek than it is to considering existential threats to humanity (here).

Academic Prioritisation jpeg

I propose that to seriously consider those dark-side scenarios you need either 1) immense psychological detachment and resilience or 2) no psychological detachment at all (a joyful embrace of the collapse narrative). In short, psychology-wise you need to be built differently from the vast majority.

Nonetheless, some true contrarians do exist in a variety of fields, for example, finance, and walk a fine line between delusion and perception. It is such people who populate Gregory Zuckerman’s book “The Greatest Trade Ever” which retells the story of five individuals who made their fortunes from the collapse of Lehman Brothers and the onset of the Great Recession. These are not Thaler’s dispassionate, calculating ‘Econs’ devoid of emotion. These are five individuals with their own rather peculiar character quirks who are naturally uncomfortable with both the status quo and the institutions that support the status quo. In this particular case, they emerge from Zuckerman’s book as prescient heroes. Of course, we never hear of the thousands of similar individuals whose backs are broken on the wheel of markets that go the wrong way.

Perhaps our differing reactions to upside and downside risk is nature’s way of hedging its bets. A few of us are comfortable operating in the super optimistic probability tail of upside risk and fewer still like Agric like to wallow in the pessimistic tail of downside risk. From an evolutionary perspective, most of the tail risk jockeys end up as road kill. But things do change, and perhaps a maladaptive mutation will suddenly becomes a vital survival trait. Those Agric-like fellows who believe they know the future will be the equivalent of bacteria on a petri dish that survive a dose of penicillin. A mutation that may previously have been an impediment becomes a life-saver as circumstances change.

We each have our own view of rationality, but it is our emotional state that keeps us sane when seeing the world. Don’t get me wrong: I am no post-modern relativist. For example, I think there does exist an objective assessment of the likelihood that the globe will experience extreme climate change leading to economic collapse by end century (and a non-negligible one at that). This is certainly not enough risk to make me run off to the wilds of Scotland, but it is a risk nevertheless. But I think that only some people can psychologically live with such a fact. Most can’t. The dominant narrative is: let’s pretend that climate change doesn’t exist as a factor in our or our children’s lives and carry on regardless.

Dylan Evans’ story may perhaps be one of the delusion of a few, but humanity’s inability to tackle climate change is a story of the delusion of the many. So let’s not laugh too long at ‘Utopia’.