The eminent British scientist James Lovelock, back in the 1970s, formulated his theory of Gaia, which held that the Earth was a kind of super organism. It had a self-regulating quality that would keep everything within that narrow band that made life possible. If things got too warm or too cold—if sunlight varied, or volcanoes caused a fall in temperatures, and so forth—Gaia would eventually compensate. This was a comforting notion. It was also wrong, as Lovelock himself later concluded. “I have to tell you, as members of the Earth’s family and an intimate part of it, that you and especially civilization are in grave danger,” he wrote in the Independent in 2006.
The world has warmed since those heady days of Gaia, and scientists have grown gloomier in their assessment of the state of the world’s climate. NASA climate scientist James Hanson has warned of a “Venus effect,” in which runaway warming turns Earth into an uninhabitable desert, with a surface temperature high enough to melt lead, sometime in the next few centuries. Even Hanson, though, is beginning to look downright optimistic compared to a new crop of climate scientists, who fret that things could head south as quickly as a handful of years, or even months, if we’re particularly unlucky. Ironically, some of them are intellectual offspring of Lovelock, the original optimist gone sour.
The true gloomsters are scientists who look at climate through the lens of “dynamical systems,” a mathematics that describes things that tend to change suddenly and are difficult to predict. It is the mathematics of the tipping point—the moment at which a “system” that has been changing slowly and predictably will suddenly “flip.” The colloquial example is the straw that breaks that camel’s back. Or you can also think of it as a ship that is stable until it tips too far in one direction and then capsizes. In this view, Earth’s climate is, or could soon be, ready to capsize, causing sudden, perhaps catastrophic, changes. And once it capsizes, it could be next to impossible to right it again.
The idea that climate behaves like a dynamical system addresses some of the key shortcomings of the conventional view of climate change—the view that looks at the planet as a whole, in terms of averages. A dynamical systems approach, by contrast, consider climate as a sum of many different parts, each with its own properties, all of them interdependent in ways that are hard to predict.
One of the most productive scientists in applying dynamical systems theory to climate is Tim Lenton at the University of East Anglia in England. Lenton is a Lovelockian two generations removed— his mentors were mentored by Lovelock. “We are looking quite hard at past data and observational data that can tell us something,” says Lenton. “Classical case studies in which you’ve seen abrupt changes in climate data. For example, in the Greenland ice-core records, you’re seeing climate jump. And the end of the Younger Dryas,” about fifteen thousand years ago, “you get a striking climate change.” So far, he says, nobody has found a big reason for such an abrupt change in these past events—no meteorite or volcano or other event that is an obvious cause—which suggests that perhaps something about the way these climate shifts occur simply makes them sudden.
Lenton is mainly interested in the future. He has tried to look for things that could possibly change suddenly and drastically even though nothing obvious may trigger them. He’s come up with a short list of nine tipping points—nine weather systems, regional in scope, that could make a rapid transition from one state to another.
India is a rapidly developing country with hundreds of millions of citizens who want to move into the middle class, drive cars and cool their homes with air-conditioning. It is also a country of poor people, many who still rely on burning agricultural waste to heat their homes and cook their suppers. Smoke from household fires has been a big source of pollution in the subcontinent, and it could disrupt the monsoons, too. The soot from these fires and from automobiles and buses in the ever more crowded cities rises into the atmosphere and drifts out over the Indian Ocean, changing the atmospheric dynamics upon which the monsoons depend. Aerosols (soot) keep much of the sun’s energy from reaching the surface, which means the monsoon doesn’t get going with the same force and takes longer to gather up a head of steam. Less rain makes it to crops.
At the same time, the buildup of greenhouse gases, coming mainly from developed countries in the northern hemisphere, has a very different effect on the Indian summer monsoons: it acts to make them stronger.
These two opposite influences make the fate of the monsoon difficult to predict and subject to instability. A small influence—a bit more carbon dioxide in the atmosphere, and a bit more brown haze—could have an out- size effect. Lenton believes that the monsoons could flip from one state to another as quickly as one year. What happens then is not a question that Lenton can answer with certainty, but he foresees two possibilities.
One is that the monsoons grow in force and intensity, but come less frequently. We have already seen hints of this in the newspapers. In the last few years rains have grown erratic and less frequent, but when they do come, they tend to dump an enormous amount of water, and in places where they wouldn’t normally do so. This is almost as bad for farmers as drought, since the rain falls on parched ground with extra force, and much of it runs off without soaking into the ground, and it causes damage to boot by washing away soil and plants. The flooding that devastated Pakistan in 2011 is a case in point. If this trend continued and strengthened in intensity, it would be bad news for the two thirds of the Indian workforce that depends on farming. It would be nasty for the Indian economy—agriculture accounts for 25 percent of GDP. A permanently erratic and harsh monsoon would depress crop yields, increase erosion on farms, and cause a rise in global food prices as India is forced to import more food.
The other possibility is even worse: the monsoons could shut down entirely. This would be an unmitigated catastrophe. A sudden stopping of monsoon rain, which accounts for 80 percent of rainfall in India, could throw a billion people into danger of starvation. It would change the Indian landscape, wiping out native species of plants and animals, force farms into bankruptcy, and exacerbate water shortages that are already creating conflict. The Indian government would almost certainly be unable to cope with a disaster of such proportions. Refugees by the hundreds of millions would stream into big cities such as Mumbai and Bangalore, looking for some hope of survival. It would create a humanitarian crisis of unprecedented proportions. Lenton foresees a similar danger of sudden change in the West African monsoon, the second tipping point.
Tipping point number three in Lenton’s list is the sea ice of the north pole. For years the ice has been thinning and retreating more and more during the summer. Soon it may disappear completely during the summer months. We may already have reached this tipping point—a transition to a new state in which the north pole is ice-free during summer months is already at hand. Eventually the north pole may flip and be free of ice year-round. The knock-on effects of such a transition would be huge—they would cause marked increase of warming at the pole, since open water absorbs more of the sun’s energy than ice-covered seas. The effect of a year-round ice-free north pole would be like heating Greenland on a skillet.
All this leads Lenton to conclude that the Greenland ice sheets could make a transition to an alternate state in three hundred years, rather than a thousand or more. Such a quick melting of Greenland would have a knock-on effect on the ocean currents that run up the Atlantic, bringing warmth to northern Europe and Scandinavia, the Atlantic thermohaline circulation. A sudden change in this current could plunge much of Europe back into an ice age. Scientists were getting nervous about this possibility a few years ago, until further research suggested that any switch in current is a long way off—perhaps a thousand years off. Lenton argues that an accelerated melting of Greenland would throw more freshwater on the northern Atlantic than these reassuring calculations have taken into account. “The canary in the coal mine is the Arctic losing its summer sea-ice cover,” says Lenton. “I am really worried about the Greenland ice sheet. It’s already losing mass and shrinking.”
If Greenland flipped into a completely ice-free state, it would cause massive rises in sea level—on the order of six or seven meters. Even if this took three hundred years to happen, “it would be an absolute disaster,” says Lenton, “a real game changer.” At such a rate of sea-level rise, it would be- come more and more difficult to protect coastlines. Low-lying areas would have to be abandoned. That includes cities such as New York, Los Angeles, San Francisco, London, Tokyo, and Hong Kong, not to mention the entire state of Florida and vast swaths of Indochina.
Tipping point number six—the west Antarctic ice sheet—is even scarier. It has enough ice on it to raise sea levels by about eighty meters. The ice is melting, but slowly—most worst-case scenarios give the ice centuries to melt. But there are some niggling doubts about whether the West Antarctic Ice Sheet could calve into the sea more quickly than expected, as the glaciers contract. If that happened, it would push sea levels up by five meters in as short a time as a century. Most experts consider this unlikely, but if it did happen, Lenton thinks the sheet could flip in as little time as three hundred years—three times faster than most models predict.
“Then we start talking about domino dynamics,” says Lenton. “The worse case would be that kind of scenario in which you tip one thing and that encourages the tipping of another. You get these cascading effects.”
It would take a perfect storm of climate flips to get us to this particular worst-case scenario. If it does come to pass, however, at least it will happen quickly.
