Jul 20, 2023 · 42m · catalyst
The good and bad of carbon capture
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gold bands on the timeline = statements, start to end. Hover to read, click to jump. CC turns on captions
Host Shail Khan and energy policy expert Dr. Emily Grubert evaluate the complex nuances of carbon capture and storage, outlining a four-part framework to distinguish indispensable industrial applications from counterproductive fossil fuel life extensions.
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 45.7% of the talking time here. How this is scored →
Shayle as informed peer 5.8 Guest teaching 5.2 Guest disagreement 3.4 Shayle pushing back 3.6
speaking balance: gold is Shayle, purple is the guest (3 minute bins)
Sharpest disagreement ▶ 34:12 Direct rejection of maximizing legacy infrastructure
Grubert explicitly pushes back on Kann's hypothesis that building any CCS expands useful shared infrastructure, declaring that she hears the argument often and strongly disagrees because it builds linear pipelines in the wrong places.
Hardest push from Shayle ▶ 10:13 Kann challenging the 'preservationist' label on gas peakersKann questions Grubert's framing of fossil CCS as merely a lifespan extension crutch, pointing out that immediate replacement of reliable natural gas capacity creates massive economic and reliability trade-offs.
Biggest teaching moment ▶ 34:35 Infrastructure lock-in and geographic misallocationGrubert educates Kann on linear infrastructure planning, explaining that building pipelines around legacy power plants creates hundred-year path dependencies that fail to serve optimal DAC and storage geography.
Shayle holds their own ▶ 39:26 Kann laying down strict accounting logic on synthetic fuelsKann breaks down the lifecycle accounting of DAC-derived synthetic aviation fuel, demonstrating his own deep expertise by showing it functions solely as an avoidance credit rather than negative emissions.
the scores for every segment, with the reasoning behind each
| Chapter | Topic | Shayle as informed peer | Guest teaching | Guest disagreement | Shayle pushing back | Why |
|---|---|---|---|---|---|---|
| Defining CCS and Category 1: Mitigating Emissions with Existing Alternatives | 6 | 5 | 2 | 4 | Kann explores the definitions and nuanced boundaries of CCS versus natural absorption, while also constructively probing Grubert's framing of Category 1 as 'preservationist' by highlighting economic and reliability trade-offs of retiring natural gas plants early. Grubert reframes 'necessary' around multi-criteria value decisions rather than absolute technical terms. | |
| Category 2: Mitigating Unavoidable Heavy Industry Process Emissions | 5 | 5 | 3 | 3 | Kann distinguishes Category 2 process emissions by arguing that alternatives like cement and steel are merely earlier stage rather than nonexistent. Grubert gently pushes back from her background as a civil engineer, expressing skepticism that genuine drop-in replacements for cement exist even in emerging forms. | |
| Categories 3 and 4: Compensatory Carbon Removal vs Atmospheric Drawdown | 6 | 4 | 3 | 4 | Kann asks whether distinguishing between compensatory carbon removal and net drawdown is a 'luxury distinction' given the desperate need to scale market volume quickly. Grubert counters that establishing governance now prevents entrenched capital structures and perverse incentives from expanding residual emissions. | |
| Sponsor Messages: Bloom Energy and Engie Partnerships | 6 | 7 | 6 | 5 | Following the mid-roll ad break, Kann poses the steelman argument that deploying Category 1 fossil CCS builds out shared pipeline and sequestration infrastructure needed for broader carbon management. Grubert firmly disagrees, demonstrating that siting pipelines around legacy point sources misplaces long-lived linear infrastructure relative to optimal direct air capture locations. | |
| Carbon Utilization Pitfalls and Overall Deployment Recommendations | 6 | 5 | 3 | 2 | Kann analyzes synthetic jet fuel accounting and points out that DAC for synfuels represents emission avoidance rather than net removal. Grubert agrees and expands on the dangers of inflated counterfactuals and triple-crediting before summarizing her priority recommendations for minimizing CCS deployment. |
Statements from this episode (11)
Shayle Kann: Achieving climate goals likely requires massive carbon capture deployment
“Well, whether we like it or not, we are probably going to have to use carbon capture and sequestration, or CCS, and lots of it in this world, if we want to achieve any of our reasonable climate goals.”
Shayle Kann: Most IPCC scenarios require storing hundreds of gigatons of CO2
“Most of the scenarios in the IPCC's sixth assessment report, which is the most recent one, include capturing and storing literally hundreds of gigatons, cumulatively, of CO₂ between now and the end of the century.”
Shayle Kann: World will likely need to go globally net negative
“We are going to get to net zero and then probably need to go even further and become net negative globally because we will have overshot our carbon budget.”
Emily Grubert: Fossil CCS primarily functions to extend fossil fuel lifespans
“In practice, because this is mostly fossil stuff, I think that ends up looking a lot like lifespan extension or some way to keep using fossil fuels into a decarbonized future.”
Emily Grubert: Cement production inherently generates CO2 despite clean energy inputs
“And cement, just the process of making it fundamentally results in CO₂ emissions, even if you did full energy switching, efficiency, all that kind of thing. Basically you're cooking limestone that drives off CO two.”
Emily Grubert: Cement may be the only sector where CCS is indispensable
“I think with regard to this category of CCS, I sometimes can convince myself that cement might be the only thing in this category where you need CCS to mitigate emissions from something.”
Emily Grubert: Carbon removal is a depletable resource due to physical constraints
“With CDR in particular, I think we would do well to really recognize this as essentially a depletable resource in some ways. You know, there's an amount of CO₂ in the atmosphere that means we're not going to run out anytime, you know, in the foreseeable future…”
Emily Grubert: Siting pipelines near fossil plants risks misallocating future DAC infrastructure
“The idea of maximizing now because you're going to need the infrastructure anyway fails, I think, in one major way, which is that it's not conscious of where that infrastructure needs to go. And in a situation where you're designing linear infrastructure like …”
Emily Grubert: Carbon removal requires less pipeline redundancy than point-source mitigation CCS
“One of the other really big infrastructure distinctions between mitigation CCS and removal CCS is basically that it matters if the CO₂ is re-released in a very different way for something that's mitigative versus removal. This even maybe applies to compensator…”
Emily Grubert: Synthetic fuel accounting lacks structures to prevent double counting credits
“We don't really have the structures in place to ensure that that
Accounting is really happening, and looking at some of the project announcements or ideas that I've seen where both ends of the spectrum are kind of claiming the mitigation is challenging, especi…”
Emily Grubert: Climate policy should minimize overall carbon capture and storage deployment
“So in my view, I think we need to at least try to get to a world that minimizes the amount of CCS that we're doing, whether that is for mitigation or removal, and basically just because it's infrastructurally intensive, it's energy intensive, all of these kind…”