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Jun 16, 2022 · 44m · catalyst

Making sense of solar engineering

Dan Visioni · 25m spoken Shayle Kann · 11m spoken
0:00 / 0:00

gold bands on the timeline = statements, start to end. Hover to read, click to jump. CC turns on captions

In this episode of Catalyst, host Shayle Kann and Cornell atmospheric scientist Dr. Dan Visioni examine the science, economics, and geopolitical governance of solar geoengineering as a potential temporary tool to curb climate warming. They evaluate various solar radiation management technologies alongside their regional ecological risks and the profound ethical challenges of controlling the global thermostat.

How this conversation actually went

Every chapter scored 0–10 on four independent dynamics. Hover any point for the reasoning behind the score. Shayle holds 30.7% of the talking time here. How this is scored →

Shayle as informed peer 3.9 Guest teaching 5.1 Guest disagreement 0.9 Shayle pushing back 1.7
05100:0015:0030:000:41–5:28 · Shayle as informed peer 0/10 Commercial Break: Bloom Energy and Engie Introductory solo monologue by Shayle Kann alongside sponsor reads for Bloom Energy and Engie. No guest interaction occurs.5:29–7:47 · Shayle as informed peer 4/10 Defining Geoengineering and Solar Radiation Management Kann explores terminology and asks if coal plants qualify as reverse geoengineering. Visioni politely reframes the definition around deliberate intent as defined by the IPCC.7:48–15:59 · Shayle as informed peer 5/10 Stratospheric Aerosol Injection and Volcanic Analogs Visioni provides a detailed scientific explanation of stratospheric aerosol injection using the 1991 Mount Pinatubo eruption as a natural analog. Kann helps summarize the findings into annual injection needs.16:03–21:47 · Shayle as informed peer 4/10 Commercial Break: Bloom Energy and Engie Following mid-roll ads, Visioni delivers a masterclass on the ecological and meteorological risks of SAI, explaining regional precipitation shifts, ozone chemistry, and diffuse radiation effects on agriculture.21:50–28:50 · Shayle as informed peer 4/10 Exploring Alternative Solar Geoengineering Technologies The conversation covers marine cloud brightening, space-based sunshades at the L1/L2 Lagrange points, and cirrus cloud thinning. Visioni walks through physical viability while Kann injects relatable sci-fi framing.28:50–39:50 · Shayle as informed peer 5/10 Research Trajectory, CDR Timelines, and Low Deployment Cost Kann asks if solar radiation management will logically follow the acceptance of CDR. Visioni counters that temporally solar geoengineering must come before scaled CDR to handle near-term peak shaving due to vast cost and deployment differentials.39:59–42:37 · Shayle as informed peer 5/10 Global Governance, Ethics, and Rogue Deployment Risks The pair discuss geopolitical governance dilemmas and the threat of rogue unilateral actors deploying cheap SAI, noting international deterrence mechanisms.0:41–5:28 · Guest teaching 0/10 Commercial Break: Bloom Energy and Engie Introductory solo monologue by Shayle Kann alongside sponsor reads for Bloom Energy and Engie. No guest interaction occurs.5:29–7:47 · Guest teaching 5/10 Defining Geoengineering and Solar Radiation Management Kann explores terminology and asks if coal plants qualify as reverse geoengineering. Visioni politely reframes the definition around deliberate intent as defined by the IPCC.7:48–15:59 · Guest teaching 6/10 Stratospheric Aerosol Injection and Volcanic Analogs Visioni provides a detailed scientific explanation of stratospheric aerosol injection using the 1991 Mount Pinatubo eruption as a natural analog. Kann helps summarize the findings into annual injection needs.16:03–21:47 · Guest teaching 7/10 Commercial Break: Bloom Energy and Engie Following mid-roll ads, Visioni delivers a masterclass on the ecological and meteorological risks of SAI, explaining regional precipitation shifts, ozone chemistry, and diffuse radiation effects on agriculture.21:50–28:50 · Guest teaching 6/10 Exploring Alternative Solar Geoengineering Technologies The conversation covers marine cloud brightening, space-based sunshades at the L1/L2 Lagrange points, and cirrus cloud thinning. Visioni walks through physical viability while Kann injects relatable sci-fi framing.28:50–39:50 · Guest teaching 7/10 Research Trajectory, CDR Timelines, and Low Deployment Cost Kann asks if solar radiation management will logically follow the acceptance of CDR. Visioni counters that temporally solar geoengineering must come before scaled CDR to handle near-term peak shaving due to vast cost and deployment differentials.39:59–42:37 · Guest teaching 5/10 Global Governance, Ethics, and Rogue Deployment Risks The pair discuss geopolitical governance dilemmas and the threat of rogue unilateral actors deploying cheap SAI, noting international deterrence mechanisms.0:41–5:28 · Guest disagreement 0/10 Commercial Break: Bloom Energy and Engie Introductory solo monologue by Shayle Kann alongside sponsor reads for Bloom Energy and Engie. No guest interaction occurs.5:29–7:47 · Guest disagreement 1/10 Defining Geoengineering and Solar Radiation Management Kann explores terminology and asks if coal plants qualify as reverse geoengineering. Visioni politely reframes the definition around deliberate intent as defined by the IPCC.7:48–15:59 · Guest disagreement 1/10 Stratospheric Aerosol Injection and Volcanic Analogs Visioni provides a detailed scientific explanation of stratospheric aerosol injection using the 1991 Mount Pinatubo eruption as a natural analog. Kann helps summarize the findings into annual injection needs.16:03–21:47 · Guest disagreement 0/10 Commercial Break: Bloom Energy and Engie Following mid-roll ads, Visioni delivers a masterclass on the ecological and meteorological risks of SAI, explaining regional precipitation shifts, ozone chemistry, and diffuse radiation effects on agriculture.21:50–28:50 · Guest disagreement 1/10 Exploring Alternative Solar Geoengineering Technologies The conversation covers marine cloud brightening, space-based sunshades at the L1/L2 Lagrange points, and cirrus cloud thinning. Visioni walks through physical viability while Kann injects relatable sci-fi framing.28:50–39:50 · Guest disagreement 2/10 Research Trajectory, CDR Timelines, and Low Deployment Cost Kann asks if solar radiation management will logically follow the acceptance of CDR. Visioni counters that temporally solar geoengineering must come before scaled CDR to handle near-term peak shaving due to vast cost and deployment differentials.39:59–42:37 · Guest disagreement 1/10 Global Governance, Ethics, and Rogue Deployment Risks The pair discuss geopolitical governance dilemmas and the threat of rogue unilateral actors deploying cheap SAI, noting international deterrence mechanisms.0:41–5:28 · Shayle pushing back 0/10 Commercial Break: Bloom Energy and Engie Introductory solo monologue by Shayle Kann alongside sponsor reads for Bloom Energy and Engie. No guest interaction occurs.5:29–7:47 · Shayle pushing back 2/10 Defining Geoengineering and Solar Radiation Management Kann explores terminology and asks if coal plants qualify as reverse geoengineering. Visioni politely reframes the definition around deliberate intent as defined by the IPCC.7:48–15:59 · Shayle pushing back 2/10 Stratospheric Aerosol Injection and Volcanic Analogs Visioni provides a detailed scientific explanation of stratospheric aerosol injection using the 1991 Mount Pinatubo eruption as a natural analog. Kann helps summarize the findings into annual injection needs.16:03–21:47 · Shayle pushing back 1/10 Commercial Break: Bloom Energy and Engie Following mid-roll ads, Visioni delivers a masterclass on the ecological and meteorological risks of SAI, explaining regional precipitation shifts, ozone chemistry, and diffuse radiation effects on agriculture.21:50–28:50 · Shayle pushing back 2/10 Exploring Alternative Solar Geoengineering Technologies The conversation covers marine cloud brightening, space-based sunshades at the L1/L2 Lagrange points, and cirrus cloud thinning. Visioni walks through physical viability while Kann injects relatable sci-fi framing.28:50–39:50 · Shayle pushing back 3/10 Research Trajectory, CDR Timelines, and Low Deployment Cost Kann asks if solar radiation management will logically follow the acceptance of CDR. Visioni counters that temporally solar geoengineering must come before scaled CDR to handle near-term peak shaving due to vast cost and deployment differentials.39:59–42:37 · Shayle pushing back 2/10 Global Governance, Ethics, and Rogue Deployment Risks The pair discuss geopolitical governance dilemmas and the threat of rogue unilateral actors deploying cheap SAI, noting international deterrence mechanisms.

speaking balance: gold is Shayle, purple is the guest (3 minute bins)

0:00 · Shayle 50.1% · guest 49.9%0:00 · Shayle 50.1% · guest 49.9%3:00 · Shayle 89.4% · guest 10.6%3:00 · Shayle 89.4% · guest 10.6%6:00 · Shayle 39.3% · guest 60.7%6:00 · Shayle 39.3% · guest 60.7%9:00 · Shayle 10% · guest 90%9:00 · Shayle 10% · guest 90%12:00 · Shayle 21.9% · guest 78.1%12:00 · Shayle 21.9% · guest 78.1%15:00 · Shayle 18.3% · guest 81.7%15:00 · Shayle 18.3% · guest 81.7%18:00 · Shayle 0% · guest 100%18:00 · Shayle 0% · guest 100%21:00 · Shayle 15.5% · guest 84.5%21:00 · Shayle 15.5% · guest 84.5%24:00 · Shayle 30.7% · guest 69.3%24:00 · Shayle 30.7% · guest 69.3%27:00 · Shayle 24.9% · guest 75.1%27:00 · Shayle 24.9% · guest 75.1%30:00 · Shayle 24.2% · guest 75.8%30:00 · Shayle 24.2% · guest 75.8%33:00 · Shayle 32% · guest 68%33:00 · Shayle 32% · guest 68%36:00 · Shayle 21.7% · guest 78.3%36:00 · Shayle 21.7% · guest 78.3%39:00 · Shayle 26.1% · guest 73.9%39:00 · Shayle 26.1% · guest 73.9%42:00 · Shayle 76% · guest 24%42:00 · Shayle 76% · guest 24%
Sharpest disagreement ▶ 35:50 Visioni rejects Kann's chronological framing on CDR vs SRM

Visioni firmly counters Kann's premise that SRM follows CDR acceptance by asserting that temporally SRM must happen before CDR can meaningfully scale.

 Hardest push from Shayle ▶ 6:06 Kann challenges the definition of geoengineering

Kann questions whether unintended anthropogenic warming from coal plants shouldn't also be classified as geoengineering in the opposite direction.

 Biggest teaching moment ▶ 6:15 Visioni clarifies deliberate intent in IPCC definitions

Visioni educates Kann on why the IPCC and climate scientists strictly reserve the term geoengineering for deliberate interventions rather than incidental byproducts.

 Shayle holds their own ▶ 14:19 Kann deduces the continuous maintenance requirement of SAI

Kann rapidly calculates the practical implications of volcanic analogs, pressing on the necessity of uninterrupted annual aerosol replenishment.
the scores for every segment, with the reasoning behind each
ChapterTopicShayle as informed peerGuest teachingGuest disagreementShayle pushing backWhy
Commercial Break: Bloom Energy and Engie 0000 Introductory solo monologue by Shayle Kann alongside sponsor reads for Bloom Energy and Engie. No guest interaction occurs.
Defining Geoengineering and Solar Radiation Management 4512 Kann explores terminology and asks if coal plants qualify as reverse geoengineering. Visioni politely reframes the definition around deliberate intent as defined by the IPCC.
Stratospheric Aerosol Injection and Volcanic Analogs 5612 Visioni provides a detailed scientific explanation of stratospheric aerosol injection using the 1991 Mount Pinatubo eruption as a natural analog. Kann helps summarize the findings into annual injection needs.
Commercial Break: Bloom Energy and Engie 4701 Following mid-roll ads, Visioni delivers a masterclass on the ecological and meteorological risks of SAI, explaining regional precipitation shifts, ozone chemistry, and diffuse radiation effects on agriculture.
Exploring Alternative Solar Geoengineering Technologies 4612 The conversation covers marine cloud brightening, space-based sunshades at the L1/L2 Lagrange points, and cirrus cloud thinning. Visioni walks through physical viability while Kann injects relatable sci-fi framing.
Research Trajectory, CDR Timelines, and Low Deployment Cost 5723 Kann asks if solar radiation management will logically follow the acceptance of CDR. Visioni counters that temporally solar geoengineering must come before scaled CDR to handle near-term peak shaving due to vast cost and deployment differentials.
Global Governance, Ethics, and Rogue Deployment Risks 5512 The pair discuss geopolitical governance dilemmas and the threat of rogue unilateral actors deploying cheap SAI, noting international deterrence mechanisms.

Statements from this episode (11)

Assertion Supported
Kann: Sulfur injection could cool Earth 0.5°C for $2 billion
“Specifically, you might be able to get about a half a degree Celsius of global cooling out of stratospheric sulfur injection for a couple of billion dollars, which is nothing, basically, comparatively.”
Shayle Kann Jun 16, 2022 ▶ 4:22
Assertion Contradicted
Visioni: There are zero active solar geoengineering field experiments globally
“So there are absolutely no small scale or large scale experiments going on anywhere on the planet.”
Dan Visioni Jun 16, 2022 ▶ 9:48
Assertion Supported
Visioni: Major 20th-century volcanic eruptions measurably cooled the planet for years
“On the other hand, when these sulfate aerosols in the stratosphere, they stay for one year or longer, and so we have observed in past volcanic eruptions, Pinatubo in 1991, other three or four that have been in the 20th century, that they have cooled the planet…”
Dan Visioni Jun 16, 2022 ▶ 11:26
Insight
Visioni: Abruptly halting solar geoengineering immediately reverts planetary temperatures
“Once we were to do it for long, once we were to keep it up for a couple of years or more, and so we actually have that cooling, then yes, of course, interrupting the injection immediately would just bring us back to whatever temperatures we would have without …”
Dan Visioni Jun 16, 2022 ▶ 15:29
Insight
Visioni: Solar geoengineering cannot fully replicate a low-CO2 climate
“By cooling with these methods or with any methods, we would not be just turning back the dial of time to a time where there was less CO₂, because the sulfates do cool differently than the CO₂ warps. And even if maybe we can try and get it as close as possible,…”
Dan Visioni Jun 16, 2022 ▶ 18:00
Opinion
Visioni: Solar geoengineering is probably better than unchecked warming
“It might still, and it probably is still going to be better than not doing than letting the warming just keep unchecked.”
Dan Visioni Jun 16, 2022 ▶ 18:34
Assertion Not checkable as stated
Visioni: Sulfate geoengineering ozone depletion would likely stay within 5%
“We, and based on what we've seen with previous volcanic corruptions, we know that the depletion of ozone wouldn't be catastrophic. It would probably be around plus or minus five percent of what it is now.”
Dan Visioni Jun 16, 2022 ▶ 19:56
Prediction Open · timeframe Jun 2072
Visioni: Space mirrors for geoengineering unlikely in next 50 years
“It is very unlikely that in the next 2030, 50 years, we could scale up space industry in a way that would allow us to have large, gigantic, controllable space mirrors at L Two.”
Dan Visioni Jun 16, 2022 ▶ 25:35
Prediction Not checkable as stated
Visioni: 20 years will not be enough to scale CDR effectively
“I do not think personally that in the 20 years are going to be enough to scale CDR solutions in a really, in a way that would really make an impact.”
Dan Visioni Jun 16, 2022 ▶ 37:20
Opinion
Visioni: Governance is the hardest challenge in solar geoengineering
“There's a lot of agreement over the fact that the governance part is actually the hardest part when it comes to solar geoengineering.”
Dan Visioni Jun 16, 2022 ▶ 40:11
Prediction Not checkable as stated
Visioni: Rogue geoengineering planes could simply be shot down
“This could be another one of the things where it is maybe unlikely that a single actor could do it because, as one reviewer once pointed out to me, you can shoot the planes out of the sky.”
Dan Visioni Jun 16, 2022 ▶ 42:15
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