How do you price the death of the world?

Climate change is hard to account for.

Grist's David Roberts writes about the distinction between climate change and other environmental problems:

The first difference is that carbon dioxide is not like other pollutants… The typical climate-policy targets that get thrown around — reducing emission rates by 80 percent by 2050, for example — are relatively meaningless. They focus on the rate of flow from the faucet. But that’s not what matters. What matters is the amount in the tub. If the tub fills up enough, global average temperature will rise more than 2 degrees Celsius and we’ll be in trouble. Avoiding that — staying within our “carbon budget” — is the name of the game.

The second difference is that climate change is irreversible.

Roberts cites a 2009 paper from Nature, "among many others":

The climate change that takes place due to increases in carbon dioxide concentration is largely irreversible for 1,000 years after emissions stop. Following cessation of emissions, removal of atmospheric carbon dioxide decreases radiative forcing, but is largely compensated by slower loss of heat to the ocean, so that atmospheric temperatures do not drop significantly for at least 1,000 years.

Climate change is notoriously tricky to deal with in standard economic terms. Part of it is that, to any normal person, something which is irreversible for 1,000 years sounds at least ten times worse than something which is irreversible for 100 years, if not even worse still.

Economically, though, the two are essentially the same. "Present value" is an economic concept dealing with the fact that money in the future is worth less than money now – because you can always invest money now and have more money in the future. Of course, that assumes long-term growth, which, if we're talking about world-changing events like anthropogenic climate change, might not be a safe assumption.

But the end result of the calculations is that nearly any cost beyond a hundred years into the future isn't worth spending money today to avoid. The intuitive conclusion – that it's worth fighting climate change harder if it will last for a millennium than a century – isn't the case. Assuming growth.

But there are even bigger problems for climate change than that. The vast majority of economic responses to it require calculating a "likely cost", and then applying that to the measures proposed to combat it. So, for example, a properly implemented carbon tax requires a calculation of the damage one tonne of CO2 does to the environment, in order to accurately price in the negative externalities.

Unfortunately, conventional ways of pricing risk rather fall over when considering something like climate change, because it carries a non-zero risk of existential threat. That is, there are proposed mechanisms whereby "runaway climate change" could present a civilisation-ending threat.

How do you price the end of civilisation? One option is to look at the value of everything in the world. It would be quite an accounting task, and one faced by the UK government last year when they had to put a price on Stonehenge to fulfil new bookkeeping requirements. The American government puts the value of the entirety of the US at $110trn, so it seems likely that the value of all the world's civilisations is well into 16 figures.

That's high, but it's countable. The real issue comes when you look at an alternative way of measuring the cost of risk, which is the amount you would pay to prevent it. Presumably, there is no sum which would not be worth spending to prevent the end of civilisation. Any cost would be less than the destruction of everything.

By that measure, then, the damage caused by an existential threat is infinite. But the problem with infinite quantities is that they don't work very well in conventional mathematics. Back to the normal risk accounting: you typically multiply the damage you are risking with the chance it will happen. So we are happy to suffer high risk of low damage – like groping for a glass of water at midnight with the lights off – or low risk of high damage – like driving a car – but not high risk of high damage – like driving a car at midnight with the lights off.

But infinity multiplied by anything other than zero is still infinity. Conventional risk assessment simply falls apart when confronted with something the magnitude of the worst possibilities of climate change.

Note too that it doesn't require the risk to be large. I think the risks of climate change are greater than most, but I also think it's extraordinarily unlikely that it actually would result in the end of civilisation. But can we rule it out with certainty?

The best way to look at it is to compare it to our every day lives. Thousands of people are killed crossing the road every day. To do so carries a non-negligible personal existential threat – that is, you might die. Yet I see people dodging traffic to get to work 30 seconds earlier every day, which suggests that, instinctively, we don't treat the risk of death with as much weight as we perhaps should.

But I think theres a different motivator at work. We know death is bad, and that it's worth doing a lot to try and avoid it; but we also know death can come from any corner. And the same is true of fighting existential threats to civilisation. If we could spend ludicrous sums to eliminate them all, it might be worth it; but who's to say we won't prevent climate change, only to die from an asteroid hit? Or cap our future development by not experimenting with nanotech, only for an angry AI to kill us in our sleep?

Climate change could be very, very bad indeed. But making the important choices about the trade-offs we should make to fight it are hard because, not despite, its seriousness.

Photograph: Getty Images.

Alex Hern is a technology reporter for the Guardian. He was formerly staff writer at the New Statesman. You should follow Alex on Twitter.

Photo: Getty
Show Hide image

Every day, Theresa May's mask slips a little further

First the Human Rights Act, now Dfid. What's next, asks Jon Ashworth.

The news that the new International Development Secretary is about to slash development spending and channel Britain's aid budget into defence spending is yet another major slip of the new government's centrist mask.

Theresa May has tried to pitch her policy agenda as prioritising social justice and a “Britain that works for everyone” but the reality is that this announcement is the true right-wing colours of her government shining through.

The appointment of the most right-wing Cabinet for decades was a major warning sign, with figures such as David Davis, who said he was “very worried” about sexual discrimination legislation, and Liam Fox, who said equal marriage was “social engineering”, now at the highest level in government.

Those of us passionate about development were horrified when Priti Patel, who has previously called for the Department for International Development to be scrapped, was appointed as the department's new Secretary of State, but few of us would have imagined such a dramatic break with Britain's strong development legacy so soon.

Not only is what is reported very dubious in terms of the strict regulations placed on development spending- and Priti Patel has already come dangerously close to crossing that line by saying we could use the aid budget to leverage trade deals - it also betrays some of the very poorest in the world at a time when many regions are facing acute humanitarian crises.

It was Gordon Brown who put international development at the heart of 13 years of Labour government, massively increasing aid spending and focusing minds in Britain and abroad on the plight of those suffering from poverty, famine and the ravages of war. David Cameron followed Gordon’s lead, enshrining the 0.7 per cent aid budget in law, making Britain the first G7 country to do so. In light of these new revelations Theresa May must now restate her commitment to the target.

Sadly, it now seems that Theresa May and Priti Patel want to turn the clock back on all that progress, diminishing Britain's role in international development and subverting the original mission of the department by turning it into a subsidiary of the Ministry of Defence, focused on self-interest and security. Not only will this create the opposite of the "outward-looking and globally-minded country" Theresa May said just weeks ago she wanted Britain to be, it’s also a betrayal of some of the poorest people across the planet.

Other examples of the right-wing traits of this Government surfaced earlier this week too. On Friday it emerged that Gerard Lopez, a tax-haven based businessman with links to Russian State banks that have been sanctioned in the wake of the Ukrainian conflict, donated £400,000 to the Tory party just months ago. Theresa May needs to tell us what meetings and interactions she has had with Lopez.

Earlier in the week Liz Truss, the new Justice Secretary, brazenly insisted that the Government would proceed with scrapping the Human Rights Act, despite fierce opposition from politicians of all parties and the public.

With so many right-wing announcements trickling though when the government has hardly had time to change the name plaques above the doors you've got to wonder and worry about what else is set to come.

Jon Ashworth is Labour MP for Leicester South.