Why increasing volatility in the weather has more immediate impact than global warming
Scientists have long warned that climate change will adversely affect weather patterns and living conditions around the world. These warnings are turning into a painful reality. Worse, the range of possible outcomes is becoming increasingly “fat tailed”: extreme weather events such as heatwaves, severe storms, and floods are more likely than normal statistical distributions would predict.
None of this bodes well for future political stability or economic prosperity. Our best hope is that the sharp sting in these tails will goad us into the necessary remedial action before things get even worse. But will it?
The public is increasingly aware that global warming is leading to more volatile weather. There have been record-setting heatwaves around the world this year, not just in India – where temperatures reached 49.2°C (120.5°F) – but also in places like the United Kingdom (40.2°C). France and China are experiencing their worst droughts on record, and four consecutive years of failed rainy seasons in Eastern Africa have put more than 50 million people at risk of “acute food insecurity.” Meanwhile, devastating storms and floods have hit Madagascar, Australia, the United States, Germany, Bangladesh, and South Africa.
This rising volatility in the weather is crucial. Short term weather fluctuations often have a much bigger impact than longer term trends. While temperature increases of 0.5°C here or there are barely perceptible, droughts, floods, and other short-term weather fluctuations can wreak deadly havoc. These events cause hundreds of thousands of deaths and enormous economic and financial damage each year.
Moreover, extreme weather events can cause changes that last far beyond the immediate shock and damage. Crucially, they can accelerate developments that might otherwise take many years. Scientists are increasingly worried about “tipping points” – such as the melting of polar ice sheets – that would carry us across thresholds of irreversible change. This could create damaging feedback loops between interconnected climate risks, all of which would spill over into the real economy, driving defaults, job losses that disproportionately harm disadvantaged communities, and political turmoil.
Aside from the damage to the physical environment, extreme weather may therefore trigger abrupt and sometimes permanent shifts in social attitudes and public policy. When people start losing their homes, livelihoods, or even their lives, politicians must respond.
Surprisingly, while we are all acutely conscious of extreme weather, forecasters still widely overlook its role in accelerating structural changes. Mainstream climate scientists and economists tend to focus on the longer-term effects of climate change brought about by global warming, with an emphasis on scenarios involving global average temperature increases in the range of only 1.5°C-2°C – the targets enshrined in the Paris climate agreement. And even in higher-temperature scenarios, it is assumed that the effects – on sea levels and agricultural output, for example – will accumulate only gradually, implying that the ultimate reckoning is several decades away.
But a recent paper – “Climate Endgame: Exploring Catastrophic Climate Change Scenarios” – shows that this conventional scenario analysis gravely understates the long-term risks, because it fails to give the more extreme climate outcomes (the fat tails) the attention they deserve. As the statistician Nassim Taleb has pointed out in the context of financial markets, conventional models struggle to handle the consequences of fat-tail events, creating a dangerous blind spot in their outlook.
Source: Climate Endgame: Exploring catastrophic climate change scenarios – Kemp et al 2022
Higher temperature pathways would unleash what the authors call the “four horsemen” of the climate endgame: famine and malnutrition, extreme weather, conflict, and vector-borne diseases. It does not take much imagination to see how this herd of apocalyptic harbingers might create social and political chaos, especially when they are all galloping together – as is already the case today with the global food crisis, war in Europe, and the ongoing pandemic.
Worse, the mention of the second horseman, extreme weather, suggests that the more immediate risks of climate change are still being underplayed. After all, extreme weather is also a driver of the other three horsemen, making it arguably the most important.
And crucially, it is already with us. Weather shocks cause suffering that grabs society’s attention far more than abstract (though no less warranted) warnings of long-term doom. Polls show that support for climate action is greater for those who have personally experienced extreme weather. Although the current upsurge in inflation means that people are less enthusiastic about measures that would hurt their own finances, the growing incidence of disasters is shrinking the minority that remains skeptical of climate change.
In this way, the fat tails of the weather – rather than the fat tails of long-term climate change – are far more likely to prompt action within the shorter time horizons that preoccupy politicians and business. That at least is the hope that should sustain us as the stings from these tails become ever more common and painful.
An edited version of this post was published by Project Syndicate.
Mark Cliffe 