Latest / Talking Science / Geoengineering – Should We Hack the Planet?

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Geoengineering – Should We Hack the Planet? · Talking Science

0:00
so um Imagine for a second that you could just
0:03
walk up to this giant industrial dial, grab the
0:06
heavy handle and like simply turn down the temperature
0:09
of the entire planet. Oh, wow. Yeah. Not through
0:12
the, you know, slow, grueling work of overhauling
0:16
our global energy grid or spending decades begging
0:19
nations to cut emissions. I mean, literally turning
0:22
a physical dial and just deliberately tinkering
0:25
with the Earth's climate systems on a massive
0:27
scale just to cool things off today. I mean,
0:30
it is a strike. It sounds like something. straight
0:34
out of a science fiction novel, honestly. Or
0:36
maybe one of those superhero movies where the
0:38
villain has a weather control machine hidden
0:41
in a volcano. It totally does. But this isn't
0:44
science fiction and it's not a movie plot. So
0:46
welcome to today's deep dive. We are looking
0:48
at a concept that used to be considered completely
0:50
taboo by the scientific community. Completely
0:52
untouchable, yeah. But now it's being discussed
0:54
at the highest levels of research. It's a field
0:56
called geoengineering. And for those of you who
0:59
might be encountering this term for the first
1:00
time today, let's just establish a clear definition.
1:02
definition right at the top. Good idea. Geoengineering
1:05
is basically the intentional large scale manipulation
1:09
of the planet's climate to counteract global
1:13
warming. And that word intentional does a lot
1:17
of heavy lifting there, I think. Right. Humanity
1:19
has, of course, been unintentionally altering
1:22
the climate for a very long time through industrialization.
1:24
But geoengineering is about doing it on purpose.
1:27
And the shift in how scientists are treating
1:29
this is, well, it's profound. Because they used
1:32
to hate this idea, right? Oh, absolutely. Until
1:34
very recently, most mainstream scientists wouldn't
1:37
even touch it. It was considered fringe, dangerous,
1:40
and, you know, highly irresponsible to even discuss
1:44
in polite academic company. Yeah, because even
1:47
talking about it felt like giving up on fixing
1:49
the actual root problem. Precisely. That was
1:52
the fear. But as the climate just keeps warming
1:55
and the impacts get more severe, a growing number
1:58
of researchers have begun to study these interventions
2:00
seriously. Out of necessity. Right. But the crucial
2:03
distinction to make here is that they aren't
2:05
studying it with enthusiasm. They are approaching
2:07
it with a profound sense of wary responsibility.
2:10
Yeah, that makes sense. There's actually a very
2:12
powerful metaphor in the research that I think
2:16
sets the perfect kind of unhurried tone for our
2:19
discussion today. Scientists are studying geoengineering
2:22
the way you might study a fire escape that you
2:25
hope you never, ever have to actually use. Wow,
2:29
that is such a vivid and honestly somewhat chilling
2:32
way to frame it. It really is. Like you want
2:34
to know the fire escape is structurally sound.
2:36
You want to know where the steps lead, but you
2:38
are praying the building never catches fire to
2:41
the point where you have to. you know break the
2:43
glass and climb out exactly you want it there
2:45
but you don't want to use it right and to understand
2:48
this planetary fire escape we first have to realize
2:51
that geoengineering isn't just one big button
2:53
on a control panel it's actually two completely
2:56
different approaches yes and confusing these
2:59
two approaches seems to be the cause of a lot
3:01
of um muddled panicky discussions out there definitely
3:04
when people hear the word geoengineering they
3:07
tend to just lump every single proposed intervention
3:10
into one chaotic bucket. But the absolute first
3:13
key to thinking clearly about this topic is to
3:16
split it into two distinct families. OK, so let's
3:19
split them. Well, what's fascinating here is
3:21
how fundamentally different they are in their
3:24
underlying mechanics. So the first family focuses
3:27
entirely on reflecting sunlight. The whole goal
3:31
is to reduce the amount of the sun's solar radiation
3:34
that actually reaches and warms the Earth's surface.
3:37
Got it. And the second family takes a completely
3:39
different route. The second family is all about
3:42
removing carbon dioxide. So this means treating
3:45
the atmosphere like a sponge we need to wring
3:47
out, literally sucking the main greenhouse gas
3:50
back out of the air after it's already been emitted
3:52
by power plants and cars. So they share the exact
3:55
same ultimate goal for you and me, which is cooling
3:58
the planet down. But because they work in completely
4:01
opposite ways, they have completely opposite
4:03
profiles of risk and reward. Yes. That's a great
4:06
way to put it. And since we are essentially talking
4:08
about, you know, playing God with the climate,
4:10
I want to start with the option that actually
4:12
terrifies me the most. This whole idea of reflecting
4:15
sunlight. Oh, it's definitely the approach that
4:17
generates the most sensational headlines. The
4:21
inspiration for this actually comes directly
4:23
from observing nature. Right, the volcanoes.
4:26
Exactly. When a large volcano erupts, it doesn't
4:29
just spew lava. It can fling a massive haze of
4:32
tiny sulfur -rich particles way, way high up
4:35
into the stratosphere. The stratosphere being
4:37
the upper layer of the atmosphere, right? Like
4:39
way above where our daily weather happens. Yes,
4:41
far above the clouds. And once those tiny particles
4:44
are up there, they spread out and act like billions
4:47
of microscopic mirrors. They increase what scientists
4:50
call the Earth's albedo, which is simply a measure
4:53
of reflectivity. Okay, albedo. Think about wearing
4:56
a black t -shirt versus a white t -shirt on a
4:58
sunny day. Oh, right. The white one is cooler.
5:01
Right, because the white t -shirt has a higher
5:03
albedo. It bounces the solar energy away. So
5:07
these volcanic particles bounce a fraction of
5:10
incoming sunlight back out into deep space before
5:13
it can even... Touch the lower atmosphere. And
5:15
we've actually seen this happen, right? We have.
5:17
We have observed this phenomenon measurably cooling
5:20
the entire planet for a year or two after major
5:23
historical eruptions. Nature has literally proven
5:26
the mechanism works. So the human proposal here
5:30
is to essentially build an artificial volcano.
5:34
Or at least mimic that natural cooling effect.
5:37
Basically. The idea is that we would deliberately
5:40
and continuously spray reflective particles using
5:43
like specialized fleets of aircraft flying at
5:46
super high altitudes to create this permanent
5:48
haze. Exactly. And the goal would be to dim the
5:51
sun just slightly, just enough to take the edge
5:54
off the warming. That is the core of the concept.
5:56
OK, let's unpack this because I'm looking at
5:58
the economics in our sources and it suggests
6:00
this would be relatively cheap to do in the grand
6:03
scheme of. global budgets. Surprisingly cheap,
6:05
yes. And it would work incredibly fast. Like
6:09
we could theoretically start cooling the planet
6:11
within a matter of months. We could. Wait, hold
6:14
on. If this sunglasses method is as cheap and
6:17
fast as you say, and we have people literally
6:20
dying from extreme heat waves all over the world
6:23
right now, isn't it actually unethical for scientists
6:26
to keep this locked away in a drawer? Why aren't
6:28
we just doing this tomorrow to save lives? It's
6:30
a fair question. But it's because the risks associated
6:34
with dimming the sun are just profound and far
6:37
-reaching. First and foremost, you have to look
6:39
at the chemistry of the atmosphere. Reflecting
6:41
sunlight doesn't fix the underlying problem of
6:44
carbon dioxide accumulation. The CO2 is still
6:46
up there, acting as a thick blanket. And human
6:49
civilization would presumably still be pumping
6:51
more of it into the sky. Because we wouldn't
6:54
feel the heat as much, so we'd keep burning fuel.
6:56
Exactly. And carbon dioxide doesn't just sit
6:58
in the air trapping heat. A massive, massive
7:01
portion of it gets absorbed by the world's oceans.
7:04
I want to pause on that for a second because
7:05
the mechanics of ocean absorption often get glossed
7:08
over in the news. How exactly does that work?
7:11
So when carbon dioxide meets seawater, they react
7:15
chemically to form carbonic acid. Oh, like...
7:19
It's like pumping carbonation gas into a soda
7:21
machine, making the water acidic. A very apt
7:24
comparison, actually. And as the oceans absorb
7:27
our excess carbon, the water becomes increasingly
7:30
acidic. This literally dissolves the calcium
7:33
carbonate shells of marine life. Oh, wow. We're
7:36
talking everything from tiny plankton at the
7:38
base of the food chain to massive coral reefs.
7:41
So dimming the sun by spraying particles into
7:44
the stratosphere does absolutely nothing to stop
7:47
ocean acidification. Nothing at all. Right. You
7:49
are entirely masking the warming symptom while
7:51
allowing the underlying disease to just ravage
7:54
the marine ecosystem. So we get cooler air, but
7:57
dead acidic oceans. I mean, that alone is a massive
7:59
catch. It gets even more complicated than that.
8:02
Tinkering with incoming sunlight alters the fundamental
8:04
energy balance that drives global weather. How
8:06
so? Well, the uneven heating of the Earth is
8:09
what creates wind, rain, and ocean currents.
8:11
By artificially altering how much solar energy
8:14
hits different parts of the globe, you risk wildly
8:16
disrupting rainfall patterns. Yeah, the research
8:19
indicates this could be incredibly uneven. Like,
8:22
putting these particles up there might successfully
8:24
cool down North America, but in the process,
8:27
it could cause a catastrophic failure of the
8:29
monsoon season in South Asia. Exactly. And this
8:33
raises an important question, perhaps the most
8:36
unsettling geopolitical dilemma in the entire
8:38
field. Who gets to control the global thermostat?
8:42
Right. If spraying particles saves one country's
8:45
agricultural sector from drought, but triggers
8:47
mass starvation in a neighboring country because
8:50
their rain just stops falling, how on earth do
8:53
we navigate that? It's incredibly messy. There
8:55
is no global United Nations consensus mechanism
8:58
for manually setting the Earth's daily temperature.
9:01
There isn't. And the potential for conflict is
9:03
staggering. That geopolitical nightmare leads
9:07
directly into a physical risk that the research
9:09
highlights. Okay, what's that? What happens if
9:11
we start doing this, we become dependent on it
9:13
to survive, and then the system breaks down.
9:15
Oh, man. Say there is a massive global economic
9:18
depression or a world war, and the international
9:21
community simply runs out of money or cooperation
9:24
to keep flying these high -altitude spraying
9:27
missions. I read this part of the source material,
9:29
and it gave me actual goosebumps. There is a
9:31
specific technical term for this scenario. Termination
9:34
shock. Termination shock, yes. Okay. It is every
9:38
bit as ominous as the name implies. Wait, I need
9:40
to make sure I understand the physics here. If
9:43
we are just blocking sunlight and then we stop
9:45
blocking it, wouldn't the temperature just go
9:47
back to whatever normal was? How does the heat
9:50
come back so aggressively? Well, because while
9:53
you were blocking the sunlight, human society
9:55
continued emitting greenhouse gases. The invisible
9:58
blanket of carbon dioxide in the atmosphere got
10:00
thicker and thicker and thicker. Oh, I see. You
10:03
were just preventing the sun's energy from getting
10:05
trapped by it during that time. Here's where
10:07
it gets really interesting or terrifying for
10:09
you listening. Think of it like this everyday
10:11
analogy. Imagine you are pressing down on a giant...
10:15
high tension metal spring with your thumb, you
10:18
are actively suppressing all that potential kinetic
10:21
energy. You are holding it back with sheer force.
10:24
But the spring is getting tighter and tighter
10:26
underneath. If your thumb slips or your arm gets
10:29
too tired and you finally let go, all that force
10:32
doesn't just gradually return to a resting state.
10:35
It violently releases all at once. That perfectly
10:38
illustrates the mechanics. If we suddenly stopped
10:41
maintaining that artificial layer of particles
10:43
in the stratosphere, All the suppressed warming
10:46
driven by that massive hidden buildup of carbon
10:50
dioxide would come roaring back. We are talking
10:53
about a sudden vertical spike in global temperatures.
10:57
Yes. The speed of the temperature change is the
10:59
true danger here. The planet would warm far faster
11:02
than any natural ecosystem could migrate or adapt.
11:05
Because it happens so fast. Exactly. Human society
11:08
wouldn't have decades to slowly relocate coastal
11:11
cities or slowly shift agricultural zones northward.
11:15
You would have a matter of years. The shock to
11:17
the system would be devastating. So by turning
11:20
on this dimmer switch in the sky, we would be
11:21
committing all future generations to keep it
11:23
running indefinitely without fail. Yes, forever.
11:27
We would be handing our great -grandchildren
11:29
this massive, terrifying planetary life support
11:32
machine and saying, whatever you do, don't ever
11:35
let funding for this drop or you'll all burn
11:37
up. It's a huge burden. It makes perfect sense
11:40
why the scientific consensus studies this purely
11:42
so we understand the threat, not because anyone
11:44
is eager to launch the planes. It is a permanent
11:47
generational trap. A trap that forces us to pivot
11:50
to the second family of geoengineering. Because
11:54
if reflecting sunlight is the fast, seemingly
11:56
cheap and terrifying trap that only masks the
11:59
symptoms, the second family is the one that actually
12:02
tries to treat the root cause of the fever. Right.
12:04
Removing carbon dioxide from the air. Exactly.
12:06
The appeal here is purely logical. If putting
12:09
greenhouse gases into the atmosphere caused the
12:11
problem, taking them back out solves the problem.
12:14
Simple as that. In theory, yes. And there are
12:17
two main avenues for doing this. The first involves
12:20
gentler, nature -based solutions. This means
12:23
massively scaling up the restoration of forests,
12:26
vastly improving agricultural soils, and protecting
12:29
coastal wetlands. Using nature's own tools. Right.
12:32
These natural systems evolved over millions of
12:35
years to pull carbon out of the air as plants
12:38
grow, locking it away safely in roots, trunks
12:41
and deep soil. And I think everyone listening
12:43
can get behind that, right? Plant more trees,
12:46
restore the swamps. bring back the deep root
12:48
prairie grasses. It has the bonus benefit of
12:51
restoring habitats for wildlife. Win -win. But
12:54
nature takes time, and the source spends a lot
12:56
of time on the high -tech versions of carbon
12:59
removal. We are talking about giant industrial
13:02
facilities built to chemically scrub carbon dioxide
13:05
directly out of the ambient air. Correct air
13:08
capture, or DAC. And the technology is not science
13:12
fiction. It exists today and it's currently operating
13:14
in several countries. Okay, let's break down
13:16
the mechanics of how you actually vacuum the
13:18
sky. How do these machines work? Well, picture
13:20
massive banks of industrial fans, similar to
13:23
the cooling towers you see on large buildings.
13:25
These fans draw huge volumes of ordinary air
13:28
and push it over specialized filters. Okay. These
13:30
filters contain chemicals that act like highly
13:32
specific magnets. They bind only to carbon dioxide
13:35
molecules while letting the oxygen and nitrogen
13:37
pass right through. Oh, that's clever. Once the
13:40
filter is completely saturated with CO2, you
13:43
have to heat it up to a very high temperature
13:45
to release the pure carbon gas, which you then
13:48
capture, compress, and ideally pump deep underground
13:51
into geological rock formations where it eventually
13:54
turns to stone. I mean, that sounds like an incredible
13:56
engineering triumph. It is. But if we connect
13:59
this to the bigger picture, we hit a really sobering
14:02
reality check. There's always a catch. Always.
14:05
The huddle isn't the chemistry. The hurdle is
14:07
the sheer scale and the energy cost. The amount
14:10
of carbon humanity has burned and poured into
14:13
the atmosphere since the start of the Industrial
14:14
Revolution is almost incomprehensibly large.
14:18
Carbon dioxide is currently measured in parts
14:20
per million. It is a trace gas, meaning it is
14:24
incredibly diffuse in the air. To put that scale
14:26
into perspective for you listening. If reflecting
14:29
sunlight is like putting a cheap pair of sunglasses
14:31
on the earth, trying to remove the carbon with
14:34
today's direct air capture machines is like trying
14:36
to vacuum an entire miles -long sandy beach using
14:40
a tiny battery -powered hand vac. That's a great
14:43
analogy. The hand vac works. It does pick up
14:46
sand. But the beach is effectively endless. pulling
14:50
a meaningful fraction of our historical emissions
14:52
back out of the sky using these machines is enormously
14:56
expensive. And we need so many of them. Right.
14:58
Building the infrastructure requires staggering
15:00
amounts of steel and concrete, and the machines
15:03
themselves require a massive amount of energy
15:05
to run, specifically the energy needed to constantly
15:08
heat up those chemical filters to release the
15:11
trapped CO2. If the electricity powering these
15:15
giant sky vacuums comes from a power plant burning
15:18
natural gas or coal, you are literally generating
15:21
carbon emissions to power the machine that sucks
15:24
up carbon emissions. You are just running in
15:26
place. Exactly. So the verdict from the scientific
15:28
community on carbon removal is very grounded.
15:30
The technology is real. It is absolutely worth
15:33
developing, optimizing, and funding because we
15:36
will likely need every tool available to clean
15:39
up residual emissions in the future. Right. It's
15:40
part of the puzzle. Yes. But it is painfully
15:43
slow. It is currently exorbitant in cost and
15:46
is in no way a quick fix for the crisis we face
15:49
today. Right. Let's take a look at the landscape
15:51
we've mapped out here. The first option, dimming
15:54
the sun, is a terrifying generational trap that
15:57
destroys the oceans and threatens global weather.
15:59
Yes. The second option, sucking the carbon out
16:02
with giant fans, is a slow, ridiculously expensive
16:06
uphill battle. Given all those massive glaring
16:10
flaws, why are scientists so incredibly worried
16:13
about society simply talking about geoengineering
16:16
in public? Yeah. Because the source spends a
16:19
significant amount of ink on this specific fear.
16:22
It brings us to the heart of the debate, which
16:24
turns out to be less about atmospheric physics
16:26
and entirely about human psychology. Yes, this
16:29
is perhaps the most crucial insight the entire
16:31
discussion. It introduces a central behavioral
16:34
concept called moral hazard. Moral hazard. Let's
16:37
define the mechanics of that for everyone. So
16:39
in economics and behavioral psychology, a moral
16:41
hazard occurs when an individual or an institution
16:44
is protected from the negative consequences of
16:47
their actions. Because they feel protected, they
16:49
end up taking much bigger, more reckless. risks.
16:51
In the context of the climate, it becomes a very
16:55
dangerous psychological trap. The deep -seated
16:58
worry among scientists is that if the general
17:00
public, and far more importantly, politicians,
17:03
policymakers, and fossil fuel executives come
17:06
to believe there is a magical technological escape
17:08
hatch waiting in the wings to cool the planet
17:11
later, they will feel much less urgency to do
17:14
the genuinely hard work today. It's a classic
17:17
human rationalization. It's like eating a dozen
17:20
donuts every single day because you convince
17:21
yourself, well, I'll just get liposuction next
17:23
year, so my diet today doesn't really matter.
17:25
Right. You use the promise of a future technological
17:28
fix to avoid changing your current behavior.
17:31
It becomes a very comforting narrative. It gives
17:33
society a convenient excuse to delay the massively
17:37
disruptive, expensive work of transitioning our
17:40
entire global economy away from fossil fuels.
17:42
Which is what we actually need to do. Exactly.
17:44
It provides cover for industries to say, let's
17:47
keep drilling for oil. The scientists will just
17:49
dim the sun or vacuum the sky when things get
17:51
too hot. The researchers who study these climate
17:54
interventions are emphatic on this point. They
17:57
see their own work being weaponized as an excuse
17:59
for inaction. So what does this all mean? The
18:02
scientists' most urgent non -negotiable point
18:05
is this. Geoengineering is absolutely not an
18:09
alternative to reducing emissions. Never. Treating
18:12
it as an alternative is a catastrophic mistake.
18:15
Cutting greenhouse gas emissions at the source,
18:17
stopping the pollution from entering the sky
18:19
in the first place, remains the absolute bedrock
18:22
foundation of human survival. Absolutely. Geoengineering
18:26
is a tool you might consider holding in your
18:28
left hand alongside emissions cuts in your right
18:30
hand, but you never, ever use it instead of them.
18:34
It functions as a supplementary emergency tool,
18:37
never a replacement for a cure. Right, so how
18:40
should we integrate all this deeply complex information?
18:43
Well, the scientific literature offers a very
18:45
clear prescription for how to view this field,
18:47
and that is with genuine humility. The Earth's
18:51
climate is a fantastically complex, chaotic system.
18:55
It really is. Everything is connected to everything
18:57
else. Deliberately intervening in it at a planetary
19:00
scale means taking actions where we cannot possibly
19:03
predict all the cascading consequences. And as
19:06
the text wisely points out, we cannot easily
19:09
run a test run on a spare planet. Right. We don't
19:11
have Earth bees sitting out in the garage where
19:13
we can try the cheap sunglasses on first to see
19:15
if the oceans die. We only have the one system.
19:18
And that is exactly why the mainstream scientific
19:21
response is to research carefully, quietly, and
19:24
cautiously. We need to understand the physics
19:27
of these options, their geopolitical risks, and
19:30
their severe limitations before any world leader
19:32
is ever in a position where they feel desperate
19:34
enough to act on them blindly. The responsible
19:37
attitude for the scientific community is to study
19:40
the mechanisms deeply. Promise very little to
19:43
the public and stay rigorously honest about how
19:46
much of the Earth's climate we simply do not
19:48
fully understand. Because geoengineering is not
19:51
a rescue mission. It is not a fantasy to make
19:53
us feel better about driving gas guzzlers. It
19:56
is a set of serious, sobering options that just
20:00
reflect how daunting the climate challenge has
20:02
become. Well said. The most important thing for
20:05
you to carry away from this deep dive is a sense
20:08
of proportion. The cheap, fast option is the
20:12
frightening one that only hides the problem.
20:14
The safe option is slow, costly, and extremely
20:18
limited in scale. Exactly. And neither of them
20:20
removes the need to cut emissions at the source.
20:23
There is no substitute for tackling the root
20:25
of the problem. We cannot reach for a planetary
20:28
quick fix. It's a vital reality check on the
20:30
limits of human technology. It really is. Now,
20:33
as we wrap up today's deep dive into the atmosphere,
20:35
we want to leave you with a final thought to
20:37
ponder on your own. We talked earlier about the
20:40
idea of a global thermostat and the terrifying
20:42
reality that we do not have a spare planet. Consider
20:46
the mechanics of our current geopolitical world.
20:49
In a landscape made up of nearly 200 sovereign
20:52
nations, what happens if one single country,
20:55
perhaps a country experiencing absolutely devastating
20:58
existential climate impacts like unbearable,
21:03
lethal heat waves or total agricultural failure
21:06
decides they simply cannot wait for a slow -moving
21:10
global consensus. Oh, it is a scenario that security
21:13
analysts consider highly plausible. What if the
21:16
desperate government decides to unilaterally
21:18
walk up to that giant thermostat dial we talked
21:20
about at the beginning? What if they just start
21:22
spraying reflective sulfur particles into the
21:24
stratosphere on their own, using their own modified
21:26
military or aviation fleet simply to cool down
21:29
their own airspace and save their own people?
21:31
It's a scary thought. How does the rest of the
21:33
world respond to a rogue climate engineer turning
21:36
the dial for everyone else? Do neighboring countries
21:38
shoot those planes down to protect their rain
21:40
clouds? It is a question of international security
21:42
that requires serious, sober thought long before
21:47
anyone actually reaches for that dial. Something
21:50
to chew on as you look up at the sky today. Thank
21:52
you so much for joining us on this deep dive.
21:54
We'll catch you next time as we continue exploring
21:56
the mechanisms and ideas that shape our world.
21:58
Until then, keep asking questions.