If You're Still Not Sick of Geoengineering: A Q&A With Jeff Goodell

DESCRIPTIONPhoto: Eric Etheridge

The SuperFreakonomics chapter on global warming generated plenty of controversy and debate about the pros and cons of geoengineering the earth. If all that attention piqued your curiosity, look no further: How to Cool the Planet: Geoengineering and the Audacious Quest to Fix Earth’s Climate by Jeff Goodell offers a book-length look at the current state of geoengineering, and its drawbacks and limitations.

Goodell, a journalist, has agreed to answer some of our questions about the book below.


Although geoengineering has only recently “gone mainstream,” it’s actually not a new concept. Can you tell us a little about the history of geoengineering?


Human beings have been dreaming about changing the weather for as long as they’ve been staring at clouds. During the 19th century, rainmakers roamed the American West, promising to bring rain by various dubious means, from setting off explosions in the sky to brewing up special chemical concoctions that were supposed to stimulate the development of clouds. None of it worked. The rainmakers were all hucksters and con artists.

The term “geoengineering” was really born during the Cold War, when the rise of computers, as well as all-powerful devices like nuclear bombs, gave scientists the idea that we could remake the earth to suit us. Edward Teller, the godfather of the hydrogen bomb, wanted to use nuclear bombs to literally move mountains and dig harbors. These ideas look absurd in hindsight, evidence of extreme technological hubris.

Today, the term geoengineering is often defined as “intentional, large-scale manipulation of the climate to reduce the risk of global warming.” In other words, it’s a tool that might be used to solve a real problem – that we are cooking the planet by dumping billions of tons of greenhouse gases into the atmosphere. Most serious scientists who think about geoengineering today are well aware of the troubling history of techno-fixes that look promising and then turn out to be disastrous. They are also very clear that the real solution to the problem of global warming is to cut greenhouse gas pollution. But because that does not seem to be happening at a rate anywhere near what is necessary to reduce the risk of climate catastrophe, some people are starting to look for other solutions – or at least ways to buy more time.


Geoengineering continues to provoke intense debate among both scientists and environmentalists for scientific, political and psychological reasons. What are the primary objections to geoengineering?


That we are messing with a system (the earth’s climate) that we don’t really understand. That geoengineering is an extension of the same technocratic thinking that got us into trouble in the first place. That geoengineering will be sold as a quick fix, reducing whatever paltry momentum is building to cap greenhouse gas emissions. That geoengineering technologies that cool the earth by blocking out small amounts of sunlight, such as injecting particles into the stratosphere, do nothing to solve other urgent environmental problems, such as ocean acidification. That geoengineering will become a tool of dominance that rich societies will use to exert their will over the poor. That, when it comes down to it, geoengineering is nothing more than a bad sci-fi novel writ large.


James Lovelock, one of the scientists featured in your book, told you that, when it comes to geoengineering, “Ignorance is not our friend.” What are the arguments in favor of testing geoengineering? How large do the tests have to be in order to be informative?


The biggest problem with the debate about geoengineering right now is that it is essentially all talk and computer model-driven speculation. The fact is, we’ve never really tried to cool the planet, so we don’t know if any of the technologies that are frequently discussed will really work, and if so, what the real-world consequences will be.

For example, we know that volcanoes can inject millions of tons of particles into the stratosphere, and that these particles act as tiny mirrors, reflecting away sunlight and cooling the planet. Mt. Pinatubo, which erupted in the Philippines in 1991, lowered the temperature of the earth by about one degree for more than a year. Can we build artificial volcanoes that do the same thing? If so, what will the impact be on rainfall in, say, the Amazon? Computer models can tell us some things, but in order to really find out if it works, and what the risks really are, we need to go out and try spraying some particles into the atmosphere and see what happens.

This is not to suggest, however, that we need earth-scale experiments anytime in the near future. Right now, there is a tremendous amount that can be learned simply from better, more sophisticated computer modeling, as well as engineering work to figure out the best way to actually inject the particles into the stratosphere.

Then there is another level of small, sub-scale experiments that would involve simply spraying a small amount of particles into the stratosphere and observing how they behave. Experiments like this would have zero risk of causing any real damage to the climate system, and yet they would tell us a tremendous amount about the real-world practicality of these ideas.

At some point, if all this smaller-scale work is done and the risks still seem modest, it might be time for bigger experiments. It is certainly true that the only way you’re going to know for sure if it works – and to create a change that is large enough to detect — is to try it on a larger scale. And while this sounds like a scary scenario to many, remember that many of the technologies that geoengineers are exploring, including injecting particles and brightening clouds, are reversible – particles fall out of the sky after about a year, clouds would vanish as soon as you turned off the cloud brightening machines. And you could start by injecting a very small amount of particles, then ramping it up slowly as we better understand the consequences.

So you can imagine all this being done in a thoughtful, rational way that in which the risks are minimal. You can also imagine it being done in a heedless, irrational way that is indeed frightening.


Geoengineering presents unique governance challenges. Ideally, what might a geoengineering governance structure look like in the future? What role should the more vulnerable developing countries play in geoengineering decisions?


Excellent question. The truth is, no one knows what a geoengineering governance structure should look like – in part because we really don’t understand how geoengineering will work, or what technologies might be deployed. A governance structure for injecting particles into the stratosphere might look very different than a governance structure for dumping iron into the oceans to stimulate plankton blooms. This is one of the key arguments for a modest geoengineering research program: the better we understand the risks and the true capabilities of some of these geoengineering technologies, the better we’ll be able to design effective governance regimes.

When it comes to governance, there are two key issues. The first is how to restrain a rogue nation – or individual, for that matter – from deciding to start geoengineering the planet on its own. There are obvious parallels here with nuclear weapons governance – a lone actor can, in theory, deploy a technological device that has a profound impact on the entire planet. When it comes to geoengineering, however, good intentions are probably more dangerous then bad ones: a rich nation or individual that is trying to “fix” the earth’s climate is just as likely to screw things up as someone with less noble goals.

The second issue is deciding whose hand is on the thermostat. We all live on the same planet – if we’re going to start deliberately messing around with the climate, are we going to try to optimize it for people of Kansas or Kenya? Obviously, geoengineering is a technological fix which, if it is ever deployed, is likely to be done by rich, technologically sophisticated nations like the U.S., China, or India. Will farmers in Bangladesh get a voice in deciding how this will play out? Is the answer a World Geoengineering Council, administered by the U.N.? An entirely new agency of some sort? No one has a clue.

One final point: there is an assumption here – perhaps a reasonable one – that if geoengineering technologies are ever deployed, they will be used for the benefit of the rich, simply because they will be carried out by the rich. But that is not necessarily true. If we figured out a way to brighten clouds and shift precipitation patterns in way that might bring more rain to parched areas of Africa, it’s not hard to imagine these technologies could be used explicitly to benefit developing nations. To put it another way, there is nothing built into the idea of geoengineering that demands it be used as a tool of dominance. It could also be used as a tool to alleviate human suffering. It is up to us.


At the end of the book, you express your hope that geoengineering never becomes necessary: “I hope that we will grasp the scale of the catastrophe that awaits us, muster up the courage and political will to cut emissions quickly and deeply…” If that doesn’t happen, which certainly seems possible at this point, are you in favor of geoengineering?


Nobody in his right mind is in favor of geoengineering. Nevertheless, we may come to a point where the risks of not trying it are outweighed by the risks of trying it. This is not the climate equivalent of building condos in a virgin redwood forest. We are already messing with the earth’s climate system in profound ways, and we are doing it mindlessly, heedless, stupidly, with a great risk to our future. Can we get better at it? I don’t know. But in my view, the greatest danger we face right now is not technological hubris. It’s human apathy.



Eartth scale experiments on the very climate that sustains us.

GREAT idea.



We do geoengineering all the time. Just one example: we straightened out rivers and decades later we've been spending large sums to try to reverse that because the environment degraded so much. On a small scale, we build jetties and other breakwaters that encourage rather than slow beach erosion.

So we do experiment. All the time. And the record shows that negative consequences become apparent after substantial time. There is thus no way to experiment with climate scale geoengineering because a) we wouldn't know for a very long time and then it might not be reversible and b) we couldn't know that a really small experiment would actually scale. That scale problem has been a big problem because we used experience with smaller streams and rivers to manipulate large ones and that caused a whole new set of problems.


Yes, geoengineering is as old as the first bridge..How about cloud seeding..it is not new..And it's disasters have been well documented.. The incomparable Geology Professor Giegengack, at the U. of Penn, LOVED to recount the tales of the Army Corps of Engineers' disasters - unaccounted for siltation at huge dams, the Salton Sea, the mud plume engulfing indonesia, the vortex created by drilling through a salt layer, that was lovely - how about GM crops - great experiment, we are now all part of..

Vonnegut saw it all, in Cats Cradle..It will come down to one last practicioner of Bokonon sitting on top of a mountain, as the world succumbs to ICE-9.


My statistics professor used to say, everyone loves to make numerical models, but hates to validate the models. To collect validation data is difficult, expensive, and introduces all sorts of messy problems into your beautiful model. But without validation, the model is useless.


Leave the incomplete, unverified, self-promoting models to the economists. Small scale trial and error experiments are meaningless in gauging the correctness of any approach that endeavors global climate change. Until all the mechanisms that impact our climate are understood please stay away from the clouds or the stratosphere or whatever. This reminds me of the early days of ecology when scientists tried to implement population control of some prolific reproducer by introducing non-native predators which eventually had to be controlled by introducing another non-native predator which ....

However, if this post is just an attempt to soothe a bruised ego, and not actually meant for public policy please continue.

David L

Amazed at how closed-minded people are, esp. on a Freakonomics blog, no less. I don't know the first thing about geoengineering. But I'm not going to reject out of hand the plausibility that a cracksquad of the most brilliant minds in environmental science could devise a series of low-risk experiments to glean more knowledge. And if you're against gleaning more knowledge, then honestly, you have no place in any conversation about anything.


Yes, nice work commenters. Do you ever get tired of saying 'no, that won't work'. Immediately before the Wright brothers no one had ever flown; before penicillin there was only the 'natural' way to cure infections. It's so easy to proclaim failure, and so hard to invent success.... so why not just stop trying?

Your armchair commentary never involves benchwork. Your perspectives are tired, and through them achievement will always be just a little too far out of reach.

Rudiger in Jersey

Idea to cure Global Warming:
Everyone open your windows. Run Air Conditioners on Maximum Cool until planet temperature sufficiently cool. When Penguins seen Central Park, ease down.

For Global Cooling: Same process but use your Heaters instead.

But the problem is getting EVERYONE to move their thermostats together. Like herding cats.

Eric M. Jones

Prayer might work. And there's always soylent green.

David, St. Petersburg

Eh ... what sort of geoengineering is going to heal the Gulf of Mexico's damage from the dead zone below the Mississippi river and the newly created dead zone created by the oil volcano?

Humans have made a mess of the Earth and there is no technological solution to the problem. On a planet with 8 - 9 billion humans there is no room for error whatsoever. Geoengineering schemes cannot solve the global warming problem nor is it possible to know that they won't actually lead to catastrophic unintended consequences.

In addition, humankind's problems have grown much bigger in recent years. Peak Oil has occurred, capitalism is poised to collapse (narrowly avoiding a collapse last week and propped up today by Europe spending $1 trillion which it doesn't have), the world's bread baskets are being deprived of water and losing their top soil, global phosphate production is declining, and there's a huge oil catastrophe occurring in the Gulf of Mexico.

Needless to say, it is better to live healthy rather than rely upon desperate measures to keep yourself alive. Unfortunately for humankind the species has chosen to live foolishly, recklessly, destructively, and without any concern about the future consequences of these behaviors.

Humankind's future is bleak.



People say this topic is controversial?

I think these comments prove that there is a consensus on what needs to be done.


Rudiger in Jersey

The problem with experimenting with the planet, is it is the only one we got. If we screw this up, we could bring on the Biblical plagues we worked so hard to avoid. Better get a spare planet just in case.

In theory it would work. In theory so did Communism, the Titanic's Impenetrable Hull, and the Atkin's Diet. But before we risk nuclear winter, the death of every single photosynthetic organism, and blizzards on Miami Beach in August maybe we should listen to a TRUE EXPERT .ie not an Economist.

Complex problems like Global Warming have complex solutions. Offering a simplistic solution is just a phony Do-It -Yourself 4-year-old child solution. With problems, people look for a Pied Piper, Professor Harold Hill or Svengali. Clean it up, move to the NEXT problem.

But this ISN'T a PROBLEM, This is the entire planet. I would feel sorry for Mr Godell when an entire starving planet huddling over campfires in Parkas during Summer, channels its angry Karma at him.

By the way, does he peddle a one step DIY solution to Middle East Peace?



The Law of Unintended Consequences has bitten us virtually every time. If we simply could know all that might happen, we could weigh the pros and cons, but, alas, we cannot...and must always take our chances.

It seems to me that if we could exert our efforts to RETURN something to its former state, rather than create a new state, we might have a better chance. For instance, instead of cooling the atmosphere by launching something into space, say, what if we could find a way to re-freeze the Arctic Ocean? We kind of know what happens if it is frozen...but we aren't so sure what happens if we try some other method of cooling the atmosphere, etc.

We know that trees cool the atmosphere, eat carbon dioxide, etc....so plant, say, a 100 billion trees?

I have a feeling that The Butterfly Effect might come back to haunt us for something so small as the destruction of mosquitoes. You just never know.

Instead of seeking to create a new heaven and earth (let's leave that to God), how about us just seeking to return it to where it was before?



To David L and Kilpatrick, you are both fools..Your perspective ALWAYS wins, don't you get it, because people REFUSE to remember the past..or to learn from it..So humanity, people just like you two lovely openminded and narcissistic men, WILL do geoengineering, that WILL be the only recourse we as a species can manage..thanks for giving us the perspecitve of the dark ages, of the Easter Islanders, of the chinese engineers busy damming the yellow river....But we don't seem to be able to get PAST that perspective (yes, of YOU< David L and Kilpatrick) and to STOP ourselves..That is what has NEVER been done, you young innocents..Despite wonderful literature art history and science, humans cannot get beyond the need to be busy busy busy.. So sorry for you, David and Kilpatrick..So sorry for us..

Christopher Strom

Thank you, David L and Kilpatrick.

I'm pretty sure that "that won't work" has NEVER solved a single problem.

Sadly, "that won't work" seems to be heard most commonly from armchair engineers and policymakers who don't have to actually solve problems or get results in real life.

But that's the safe bet: one can argue against any proposal with the claim that "there will be unintended consequences" - of course there are, and one would learn this if one actually did new things. And it follows that such people will respond to unintended consequences with admonishments of "I told you so" - thus successfully avoiding making a decision, taking a stand, or performing any useful function whatsoever.

(Yes, Elkayef, jonathan, trace, Jose, and Rudiger, I'm talking to you.)

Is there really anyone out there who out there thinks that we've not been effectively geoengineering the Earth for well over a century now? Geoengineering doesn't have to be deliberate to have profound impacts on our quality of life - that and our survival at the margins, which is what we're really talking about.

It is precisely because we enjoy our lifestyles and have populated the entire globe that we will have to eventually learn how to deliberately manipulate conditions - possibly on a planet-wide scale - to try to offset the unintended consequences of our lifestyle. The sooner we begin experimenting, the more we can learn about some of the "unintended consequences" of geoengineering tactics.

We will do this eventually. And neither pretending there is no problem, nor dismissing proposals as being "too unknown" will change the fact that this is the only place we have to live.



I once came across a Victorian geoengineering suggestion. Someone had looked at a map of Africa, and pointed out that with only a few dams, a vast territory (several modern day countries) could be turned into a lake, and eventually water would flow out to irrigate the Sahara.

We now know that sufficiently large water reservoirs cause earthquakes as the land shifts to accommodate the new weight. This would have made it a Bad Idea, quite apart from the political problems of taking many countries' water supplies and using it to flood a few more countries.

Alas, I have not seen any further reference to this plan, so I have not got any details.


A panel of Noble prize winners ranked a specific Geoengineering technology (Research into Marine Cloud Whitening) first among several alternatives to Global Warming:


You will notice that carbon cuts solution (like the ones proposed by Kyoto) are ranked well lower.

Phil Z

I have been wondering for over 40 years when someone would make a serious attempt to control global weather.

Google "HAARP" and look into the future, thanks to those fun loving kids in the U.S. government.

Cindy Pikoulas

Mr. Goodell needs to come forward and admit that geoengineering has been occuring throughout the globe on a daily basis since the 90's. There have been patents in place since the 70's for the chemical aerosols which are released from airplanes high up in the atmosphere. Everyone needs to educate themselves regarding Solar Radiation Management as there is a bill in the Senate (601) to implement these programs. There has not been any public discussion or oversight and there will be none if the citizenry does get involved. Aluminum is the metal of choice for altering the planet. Aluminum is linked to autism (1:70 boys), alzheimers (epidemic proporations), allergies (epidemic proportions) and asthma (leading killer of children).


If humans are the cause of "global warming" then wouldn't it be safe to say we are already doing earth-scale geoengineering?

Considering the majority of greenhouse gasses comes from livestock and not from cars or industry suggests that these greenhouse gasses will not decrease as long as the human population increases.

Even though eating meat contributes to green house gasses I don't plan to stop eating meat and I doubt a significant percentage of humans would either.

So for all you arm-chair engineers who only know how to say "no that won't work," what is your solution to "global warming?"