Energy for Growth Hub
Multimedia Jun 07, 2021

Episode #5 Ken Caldeira: Let’s Align Self-Interest with Global Climate Interest

One of the world’s most visionary climate scientists tells Katie & Rose why he thinks nuclear energy is…

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One of the world’s most visionary climate scientists tells Katie & Rose why he thinks nuclear energy is key to quelling climate change and delivering prosperity to the developing world, why he’s gone all-positive on Twitter, why considering solar geoengineering won’t stop us from addressing climate change, and what he learned from pumping crocodile stomachs as a grad student.


Ken Caldeira has been the senior scientist at Carnegie Institution’s Department of Global Ecology on the Stanford University campus in California since 2005. He is also a professor (by courtesy) in Stanford University’s Department of Earth System Science. Caldeira analyzes the world’s climate systems, studying the global carbon cycle; marine biogeochemistry and chemical oceanography, including ocean acidification and the atmosphere/ocean carbon cycle; land-cover and climate change; the long-term evolution of climate and geochemical cycles; climate intervention proposals; and energy technology. Caldeira has contributed to several key reports for the U.S. National Academy of Sciences as well as the Intergovernmental Panel on Climate Change (IPCC). He also participated in the UK Royal Society geoengineering panel (2009) and ocean acidification panel (2005).

Show Notes

Amped Up

Ken Caldeira Interview




KATIE:  I’m Katie Auth in Washington.


ROSE:  And I’m Rose Mutiso in London, and this is High Energy Planet, the podcast from the Energy for Growth Hub about new ideas to solve global energy poverty.


KATIE:  On Today’s show, a visionary climate scientist on what he sees next for climate action and equity.  We talk with Ken Caldeira, senior scientist at Breakthrough Energy and at the Carnegie Institution’s Department of Global Ecology.  Ken brought the concept of ocean acidification to world attention, and he’s been talking about net zero since 2005.


ROSE:  We’ll ask Ken how less-wealthy countries can develop while the world achieves its climate goals, what out-of-the-box climate solution he’s most excited about, and why he turned from LSD to computer programming as an escape from real life early in his career.


KATIE:  But first Rose gets amped up about the new lithium gold rush in the United States.


ROSE:  All that coming up in this episode of High Energy Planet.




KATIE:  Now it’s time for Amped Up, when we talk about what we can’t stop thinking about right now in the energy and development space.  So Rose, this week you’re obsessing about Nevada, which is a part of the world that you and I don’t generally spend a lot of time talking about together.  What’s up in Nevada?


ROSE:  Yeah.  So Katie, when people are obsessing about Nevada it’s usually I think Vegas, so none of that for me.  [LAUGHTER] But I’ve been following the news of the new lithium mine in northern Nevada which has drawn fierce opposition from both indigenous and environmental groups.  So as you know lithium is a critical raw material for the batteries that we need to make our EV and renewable energy revolutions succeed.  And the U.S. is itching to tap into its large lithium reserves to fuel this growth and reduce reliance on foreign sources.  This whole kind of incident in Nevada points to a bigger conversation about the dirty underbelly of green energy and how extracting many of the raw materials needed for the clean energy transition can be pretty ruinous to both human and environmental health.


KATIE:  Yeah.  And it’s not just in Nevada, right?  I mean, the supplies to places like the DRC as well.


KEN:  Exactly, yeah.  So you may be familiar with the terrible abuses related to cobalt mining in DRC, which produces about half of the world’s supply of the mineral, which is another critical one for EVs.  So this reminded me of so many conversations that we’ve had about how multidimensional the climate challenge is, particularly in the developing-world context, and the dangers of a simplistic focus on emissions targets and silver-bullet fixes.  So clearly the same is true for the broader climate and clean-energy space, that when we focus on just one metric and one thing we may lose site of the bigger picture in that we need nuance and (inaudible) thinking applied across the board so that we don’t kind of end up with all of these unintended consequences and externalities in our dogged pursuit of the one thing in our kind of narrow-minded vision.


KATIE:  Yeah.  I mean, I imagine this also factors into conversations about climate justice.  If the E.U., and the U.S., and China are extracting lithium and cobalt from energy-poor countries to fuel, you know, a global tech industry that at least for now barely benefits those countries, how fair is that?


ROSE:  The answer is not, not very fair.  All right, so if you have an energy or development obsession, good or bad, tweet it to us at @EnergyforGrowth and we’ll include it in an upcoming episode.  Coming up we talk with Ken Caldeira about the usefulness of climate alarmism and how he would balance climate and development goals in poor countries.




KATIE:  Ken, welcome to High Energy Planet.  It’s so wonderful to have you here.


KEN:  Thanks for inviting me.


KATIE:  So we’re just going to dive in with a pretty big question, which is a couple of years ago you tweeted, “Imagine it’s the year 2100 and the poorest parts of the world are prosperous and carbon-free.  What had to be true to make that happen?”  And I’m curious how you yourself would answer that question.


KEN:  I’m not an energy-systems engineer, and so I’m a little reluctant to make very specific predictions about future trajectories of energy systems.  But to my mind, while wind and solar and a lot of these other technologies have a lot of nice properties they really require a real transformation of how our whole electricity grid works.  And it’s just much simpler to have centralized power generation and distributed consumption.  And there are very few energy sources or power sources that can provide huge amounts of power in concentrated forms with proven technologies without emitting carbon dioxide into the atmosphere.  Nuclear power is one of the very few technologies that could potentially meet those requirements.  And so if you would ask me, like, what’s the most likely way we can have a prosperous future with low carbon emissions I would guess it’s going to depend a lot on nuclear power.  That’s not to say over the course of the rest of the century a lot of other technologies could be invented and developed and so on.  So I’m not making a prediction.  But if you’re just asking for my sense of what’s the most likely path to be successful given what we know today I would guess a heavy reliance on nuclear power.


KATIE:  Not an uncontroversial position to take at the moment.


KEN:  You know, one of the things–and this is actually in many different contexts–I’ve found that often it’s better to argue for good process than to argue for specific outcomes.  And so I don’t pretend I really know what’s going to be the best technology mix in 2100.  But I do know that if we prematurely push things off the table and don’t subject various technologies to a fairly objective analysis that we might end up building some things that aren’t so good and overlooking things that could be very helpful.  So really my focus is on trying to get good process and open, transparent, inclusive processes with obviously democratic and local determination for people.


ROSE:  So Ken, continuing this theme of prosperity and climate and balancing those two things, you authored a paper last year that found that if poor countries waited to decarbonize until they reached about $10,000 per capita GDP, it would cause less than .3 degrees Celsius’ additional warming.  And that suggests that we should just leave poor countries to develop and kind of take down the climate pressure on that side.  But on the other hand you’ve also returned a paper finding that less-wealthy countries shouldn’t be allowed to get locked into long-term fossil-fuel infrastructure.  So how do we reconcile those two things?


KEN:  Well, first of all to push back a little bit on your language, I probably wouldn’t have said “shouldn’t be allowed,” because, you know, I don’t think it’s my responsibility to tell others what they can and can’t do.  And so…


ROSE:  Very fair point.  [CROSSTALK] You pass the Energy for Growth Hub Climate Justice Test.


KEN:  [LAUGHTER] And so, you know, I guess the question is how can we help make it in everyone’s self-interest to behave in ways that are also good globally?  And, you know, if you look historically the amount of emissions that have come out of sub-Saharan Africa, say, is climatically-negligible.  And, you know, it’s a little odd for the West, who’ve developed based on fossil-fuel emissions to say to other countries, “Well, you can’t develop the same way what we did.”  So one question is if you’re developing on a fossil-fueled economy what could we do to make it (an) easier transition off of that?  And this is, again, coming back to this nuclear issue.  So let’s say you build a natural gas plant and it’s centralized.  Well, maybe later you’ll replace that with a nuclear power plant, something like this.  And you still have this sort of hub and (spoke) kind of electricity system.  But if you think the future’s going to be wind and solar then you might want to build a different kind of electricity grid now even if it’s fossil fuel, just in anticipation of this distributed system later.


ROSE:  I think then this for me naturally leads to this question of, well, the people who are actually locked in are the rich people.  How do we square that circle?  You know, you’ve advocated for hard zero-emissions targets and you’ve likened this kind of hilariously to we need to seek to fully eliminate muggings of older ladies, rather than setting a rate for muggings that we can live with, you know?  So basically we can’t live with old ladies being mugged, and we shouldn’t live with old ladies being mugged, and we shouldn’t live with more carbon in the air.  But then you’ve also expressed a lot of skepticism about the viability of (coupled removal) at scale, which is central to many of our climate models and to this world that we live in that is fossil-based now and into the foreseeable future.  So how do you reconcile these two positions if, okay, putting poor countries to one side you have some breathing room?  What do we say to the rest of the world?


KEN:  I’ve been a climate scientist, bio (inaudible) chemist, and climate physicist and so on for my whole career.  And then over the last – more recently switched to trying to focus more on energy systems and solutions and so on.  And with that was the recognition that most people most of the time operate in what they perceive to be their self-interest, and that you’re going to solve this problem when you align people’s self-interest with a more global interest.  And one of the ways you do that is by making the better energy sources even better and cheaper and so on so that it’s the least cost approach.  And I also think that there’s – in the same way that there is a portfolio of energy technologies that will be used, there’s a portfolio of political strategies.  And so I find this somewhat disturbing, that…  You know, I think, you know, some people should be working to pass legislation through congress.  And that means you need to – for the way the Senate is now that you need to get Republican votes.  And so you have to be very careful.  And there’s other people should be saying, “oh, we need zero emissions today, and we should be sending boatloads of money to poor countries to pay their cost differential.”  And I see these different political strategies as supporting each other, and that I really wish that people could appreciate the diverse – that there’s actually value in political disagreement.


ROSE:  It’s an ecosystem.


KEN:  Yeah, and that – and it really bothers me, like, to go on Twitter and see, you know, people badmouthing each other who are working towards the same goal through different strategies.  Because I think these strategies are complimentary, and if people would sort of focus a little more on advancing their positive vision and a little less time expressing their negative energy about somebody else’s vision, that we’d all be better off.


KATIE:  So the political strategy of climate alarmism really didn’t work particularly well for about three decades.  But now terms like “climate emergency” and “climate crisis” are part of policy lingua franca, and climate action is at the forefront of many policy agendas, at least rhetorically.  So what do you think was the tipping point?  And does using a framework of urgency change the way we think about or react to climate change?


KEN:  So I think that one of the things that was really important for changing the political landscape is the reduction in costs in wind and solar power, that in large part was brought about I think by Germany’s energy (vendor) program.  So I think the idea that, oh, it might actually be feasible to deploy some of this stuff, it might not cost that much, I think moved a lot of people to see the energy system transition as something that might be done realistically.  And I think this shows the importance of cost in that wind and solar got cheaper, making it feasible to deploy, made people take energy system transition more seriously.  So I think that’s one component.  And I think that a more thorough-going energy system transition will depend on making other technologies cheaper as well.  Now, with regard to rhetoric, that adds a tougher question.  Just the social dynamic encourages a kind of ratcheting up of rhetoric, right, so that, okay, we have two degrees.  Well, I’m going to say we should stabilize at 1.5 degrees.  Well, I’m going to say 1.25.  I’m going to – you know?  And so that – you can always get some social credit by saying something slightly more extreme than what the mainstream view is now.  So I think – you know, I used to say things like, oh, we shouldn’t research adaptation because that will make people acknowledge that there’s going to be climate change, and that – just make it more likely, so we should just work on climate-change avoidance and not on adaptation.  And so I used to be somebody who was taking the more extreme positions and kind of saying negative things about people who are taking more compromising positions.  And I still – I don’t think any of my beliefs about, like, if I were the benevolent dictator of the world what would be the good thing to do is, hasn’t really shifted.  And I think what’s shifted is my sense of how change happens in the world.  And I think change happens by making more people see it in their self-interest.


ROSE:  You sound like a man who’s briefed congress, Ken [LAUGHTER].  You know, out of the lab and into congress.


KEN:  Well, one of the most depressing things for congress was–this was on ocean acidification–I testified in a hearing for some legislation that – money to fund research into ocean acidification.  At the end of it, after the formal testimony was over, the staffer walked up to me and said, “Okay, so what part of ocean science’s budget shall we take this money from?”


ROSE:  Oh no.


KEN:  “Because of course we’re not going to expand funding for marine sciences.”  And I felt, like, oh man, I did all this work just to shift…


ROSE:  Oh Ken.


KEN:  …(how) that marine science (inaudible) was.


ROSE:  There’s some species of jellyfish or octopus or something that’s dead because of you [LAUGHTER], unstudied.




ROSE:  Coming up, we ask Ken about his mixed feelings about geoengineering and his new approach to Twitter.


KATIE:  And we play Rant or Rave to find out about his checkered past as a bassist and a pumper of crocodile stomachs.




KATIE:  So Ken, you’ve been advising Bill Gates for about 15 years I think on climate change, arranging learning sessions for him with climate scientists and thinkers from around the world.  I’m actually curious, how did you go about designing that curriculum when you’re dealing with one of the most complex and multidimensional issues on the planet?  Where do you start?


KEN:  What I really liked about these sessions is that I could get these world’s leading experts in whatever–hydrogen, cement, battery technologies, whatever–and I could be there asking the stupid questions and being the student.  And I think that being willing to expose my own ignorance all the time is really – I think me feeling comfortable with that also let me play this role well.  Because then (inaudible) I could ask – I figure if I have a question there’s probably other people in the room with the same question.  I used to feel like I knew what to do politically and that I also felt like I knew a lot of things.  And as time has gone on I think I’ve become less sure I know the right things to do politically and more accepting of a diversity of political strategies.  And also my – the awareness of what I don’t know has grown faster than my knowledge.  And so I think this has put me in a good position to be in these kind of helpful and advisory roles.  Because – and I also have a commitment to process and that – let’s have an open, inclusive, and fact-based process.  And so I think all of these qualities put me in a good position to be in roles where I’m trying to help develop a good process, and bring in good information, and help facilitate others to make good decisions.


ROSE:  That’s really great, Ken.  I wonder how much this kind of softening of your posture has equipped you for Twitter fights.  But that’s – we’ll discuss that later.  Where, you know, it’s very absolutist now, like, where you have to know and speak with so much confidence.


KEN:  I’ve actually changed my Twitter strategy substantially and with very positive outcomes.  And basically I’ve decided to try to not say anything negative on Twitter, and not to respond to negative comments to me, and just try to be entirely positive on Twitter.  And I see this in my own sort of family relations or spousal relations as well, that the…  You know, often we say negative things and it’s more about us releasing our negative emotions, and it’s not really about trying to effect positive change in the world.  And I think it’s very rare that a negative statement produces a positive outcome.  And I see this even with, say, my postdocs and students, where if I’m not very careful, even if I’m trying to make a positive suggestion, people can hear that as a criticism of what they did wasn’t good enough, and that people are – get hurt very easily.  And I think we’re just not aware of how much our negative statements hurt people.  And I think unless you’re really sure that this negative statement will produce a positive outcome, that you shouldn’t do it, and that it’s more about yourself trying to get attention or release emotions, and not really about trying to help anybody.  And so, yeah, I think just being really a little thoughtful–am I helping somebody by doing this?


KATIE:  So we wanted to talk a little bit about geoengineering.  In the past you’ve called yourself a [quote] “reluctant advocate” of researching solar geoengineering.  And as of 2014 you thought there was maybe something like a 20% chance that somebody would ultimately try it.  And, you know, now we’re in 2021–would you bet on different odds today?


KEN:  All the model simulations of solar geoengineering suggest that it would basically work to offset most climate change for most people, most of the time.  Now, it doesn’t save you the need to do an energy-system transition, because everybody acknowledges that if greenhouse gases continue to accumulate in the atmosphere and you continue engineering the planet to mask that, that eventually that’s going to lead to some pretty nasty outcome.  On the other hand, you know, if we get to mid-century or beyond and there’s massive crop failures throughout the tropics and, you know, widespread suffering, and richer countries aren’t really doing anything to alleviate that suffering, that solar geoengineering is basically the only way known to cause the planet to cool within years to decades, that energy system transitions…  Basically if you zero out emissions the planet even continues to warm; it doesn’t start cooling for centuries.  And I don’t know what the likelihood of some kind of crop failure throughout the tropics is.  But, you know, if that should happen…  Well, first of all I’d also like to say that I don’t think there’s any reason why anybody, even in that situation, anybody would need to go hungry in the world.  Because there’s enough food produced, if you look at all the waste of food going on in the United States and Europe and so on.  And so I think if there ever is geoengineering it’s going to be multiple failures.  First of all, the failure of the social system to prevent the CO2 emissions.  But, you know, so then the direct climate crisis.  But then it’ll also need to be a social failure that the global community doesn’t mobilize to address issues.  But, you know, the global community hasn’t been very good at mobilizing to address important issues to date.  And so I think – you know, I guess the question – I don’t know what the likelihood that there’ll be something perceived as an acute climate crisis that needs to be dealt with right now.  But if that’s felt the only – solar geoengineering is really the only thing that could cool the planet.  And, you know, if you were the leader of a country and people were starving to death, and you felt that you could save lives by solar geoengineering, and, you know, that I think you would be remiss not to give it serious consideration.  And so I don’t know what the chances of having sort of widespread famines or something like that is, but I think if that happens the possibility of solar geoengineering could be quite high.


KATIE:  Do you worry that the prospect of geoengineering, kind of having this as a last-resort solution, kind of impedes action now?


KEN:  I don’t think it really does.  I mean, there’s different metaphors for it, but I would look at solar geoengineering as kind of, like, the morphine for the cancer patient, you know, that it provides some symptomatic relief but it’s not addressing the root causes.  And, you know, I mean, and when you say that, well, you know, if you have cancer morphine can be extremely valuable.  So symptomatic relief shouldn’t be scoffed at.  But I don’t think really that the prospect of solar geoengineering is preventing action on climate change.  I think that there was some rhetoric in that direction maybe a decade or so ago.  But I think now everyone understands that even if you’re doing solar geoengineering you still need to stop emitting CO2.  It’s not – doesn’t work to do both at the same time.


KATIE:  Yeah.




ROSE:  Okay Ken, now it’s time to play Rant or Rave.  So this is a quick-fire game where we say a word or a term and you go on a short – very short rant or rave about it.  Are you ready?


KEN:  Okay, I’ll give it a go [LAUGHTER].


ROSE:  All right, rant or rave: hallucinogenic drugs?


KEN:  I enjoyed them when I was in high school.  I would be afraid to take them now.


KATIE:  Rant or rave: pumping crocodile stomachs?


KEN:  Not pleasant, a little bit similar to (inaudible), but a very interesting experience.  Before I went to graduate school I was a software developer in the financial district in New York.  And between software development projects I did other kinds of projects.  And one of the things I did was go to Mexico and work as a field assistant to some herpetologists in the Mexican rainforest, the Selva Lacandona.  And one of the things that they were doing was ecological study of the crocodiles there and looking at both their population and what they were eating.  And so we were out there trying to catch crocodiles, and tag them, and pump their stomachs and see what they’re eating.  And so a crocodile sits with its mouth open and basically waits for a fish or something to swim past it, and then it closes its mouth.  And even a grownup crocodile will eat little bugs and little tiny fish.  And they might just get, like, one fish a month.  And that was actually the experience that made me go back to graduate school and get a PhD.  Because I thought, oh, if I don’t get a PhD I’m always going to be somebody’s field assistant.  If I want to lead expeditions I have to get a PhD.  And so anyway, it was a really fun and interesting thing, and really my motivation for going back to – to going to graduate school was to try to lead field expeditions in the rainforest, which I never did.  But I did finally get to go to coral reefs so that’s pretty good.


ROSE:  Climate purity tests?


KEN:  I don’t like them so much.


KATIE:  Okay, this is a throwback.  Punk-funk and Fists of Facts.


KEN:  I like playing bass guitar, and I still – I played last night, but just by myself.  No – anyway…  I went to Rutgers College in New Jersey and a bunch of my friends and I all moved into New York City when we graduated.  And all my friends were artists and musicians in fairly reasonably-successful bands.  And I went and did computer programming work on Wall Street, which was, like, the boring thing to do.  But anyway, I still played music with my friends, and we had a band and we called it “Fist of Facts,” an idea – even then it was the idea that facts did have this political import.  Even before graduate school I was still on that kind of thread [CROSSTALK]…


KATIE:  Science fights back.


KEN:  Yeah.  So – and we played – we were basically fans of Fela Kuti and, you know, had our sort of downtown New York version of Afrobeat I guess and reggae kind of stuff.  So that was our [CROSSTALK].


ROSE:  That’s awesome. [LAUGHTER]


KATIE:  We have to look you up after this.


ROSE:  Definitely on (Spotify).


KEN:  [CROSSTALK] not so good.  But we’re on Spotify, so… [LAUGHTER]


ROSE:  That is so great.


KATIE:  All right, final one.  Bets with Ted Nordaus?


KEN:  Oh yeah.  So we’ve had about whether…


ROSE:  The (peaking) emissions.


KEN:  …[CROSSTALK] would ri- have already peaked, CO2 emissions have already peaked.  And I think I’m going to be winning a bet very soon.


ROSE:  All right, good one.


KATIE:  Unfortunately yeah.


KEN:  And actually this was actually even symbolic on this bet, because we had to say what charity we wanted to give it to.  And just that I said I want to give to the Doctors without Borders to say, look, it’s not all climate change. [LAUGHTER]


ROSE:  All right Ken, thanks so much for being with us on High Energy Planet.  We’ve really enjoyed this discussion; it’s been a lot of fun.


KATIE:  Thanks Ken.


KEN:  Thank you.




ROSE:  That’s it for today’s show.  High Energy Planet is a production of the Energy for Growth Hub, an energy solutions connector matching policymakers with evidence-based pathways to a high-energy future for everyone.  Find out more at and tweet your questions and thoughts to us at @EnergyforGrowth.


KATIE:  If you liked today’s episode be sure to rate and rank the podcast and tell a friend about us.  Bob Lalasz is our executive producer, (Gray Johnson) is our senior producer.  Join us next time for more High Energy Planet.