Jun 9, 2022 · 40m · catalyst
From biowaste to “biogold”
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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 Khan and Carbon Direct Chief Scientist Dr. Julio Friedmann analyze the role of waste biomass in climate tech, exploring feedstock supply competition, technological conversion pathways, and the strategic trade-offs between clean fuel production and permanent carbon removal.
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 29.5% of the talking time here. How this is scored →
Shayle as informed peer 5.3 Guest teaching 4.2 Guest disagreement 1.9 Shayle pushing back 1.9
speaking balance: gold is Shayle, purple is the guest (3 minute bins)
Sharpest disagreement ▶ 28:23 Julio rejects the premise that SAF cannot scale
Julio explicitly rejects Shayle's claim that bio-SAF is an unscalable rabbit hole, pointing out that existing airport infrastructure and local trash availability solve the distribution problem.
Hardest push from Shayle ▶ 27:28 Shayle challenges the systemic viability of bio-based SAFShayle presses Julio on whether dedicating millions of tons of biomass to jet fuel is fundamentally unscalable and creates distortive supply competition.
Biggest teaching moment ▶ 4:49 Julio corrects host on natural carbon equilibriumJulio corrects Shayle's assertion that natural biomass acts as a net carbon sink, educating him on the pre-industrial carbon cycle being in neutral equilibrium.
Shayle holds their own ▶ 13:41 Shayle identifies the corn-ethanol crop replacement trapShayle demonstrates deep market expertise by anticipating how waste-limited facilities face commercial incentives to switch to dedicated agricultural crops.
the scores for every segment, with the reasoning behind each
| Chapter | Topic | Shayle as informed peer | Guest teaching | Guest disagreement | Shayle pushing back | Why |
|---|---|---|---|---|---|---|
| Biomass in the Natural and Anthropogenic Carbon Cycle | 5 | 6 | 2 | 1 | Shayle frames the complex role of biomass across the carbon cycle but incorrectly posits that natural biomass is inherently a net sink. Julio politely corrects him by clarifying that pre-human natural biomass was in net equilibrium. | |
| Categorizing the Spectrum of Biomass Types | 4 | 3 | 1 | 1 | Shayle asks how to categorize biomass beyond forestry and brings up agricultural energy crops. Julio agrees and details the breadth across soils, kelp, soy, and palm oil. | |
| Defining Waste Biomass and Climate Potential | 5 | 4 | 1 | 1 | Shayle probes the definition of waste biomass and why commercial developers prioritize it over purpose-grown crops. Julio details the three primary waste streams and quantifies their gigaton-scale CO2 removal potential. | |
| Feedstock Aggregation, Logistics, and Ethical Sourcing | 6 | 4 | 2 | 3 | Shayle challenges the assumption that distributed waste biomass can be aggregated efficiently at gigaton scale. Julio responds by showing where agricultural and municipal wastes are already pre-concentrated, while warning against eco-colonial supply chains. | |
| Scaling Limits and Supply Competition | 6 | 3 | 1 | 2 | Shayle cites the historical analogy of corn ethanol to ask if waste projects will ultimately slide into growing dedicated crops when feedstock hits local limits. Julio validates the concern and explains the necessity of prioritizing high-value abatement uses. | |
| Technological Conversion Pathways for Biomass | 5 | 5 | 2 | 2 | Shayle prompts Julio on why biomass is not simply combusted for baseload electricity. Julio dismisses simple combustion as low-value and outlines advanced gasification, pyrolysis, and permanent carbon disposal pathways. | |
| Sponsor Break: Bloom Energy and Engie | 5 | 3 | 2 | 2 | Following sponsor messaging, the discussion focuses on feedstock competition and policy priorities. Julio highlights how long-term offtake competition challenges the very notion of 'waste.' | |
| Scalability and Challenges of Sustainable Aviation Fuels | 6 | 5 | 5 | 4 | Shayle pushes hard on whether scaling bio-based sustainable aviation fuels is a dead-end pursuit due to extreme volumetric feedstock requirements. Julio explicitly rejects the skepticism, citing airport infrastructure and the efficiency of shipping finished fuels over wet biomass. | |
| BiCRS and the Economics of Carbon Removal | 5 | 5 | 1 | 1 | Shayle asks about the economics of pure carbon removal without energy co-products. Julio introduces the Aines Principle and shows that sequestering carbon yields superior economics above modest carbon price thresholds. | |
| Assessing the Climate Impact of Bioplastics | 6 | 4 | 2 | 2 | Shayle inquires about bioplastics and whether a true liquid commodity market exists for waste biomass. Julio notes bioplastics lack climate-scale impact (1 Gt market) and details the current transition toward standardized global biomass trading. |
Statements from this episode (14)
Friedmann: Waste biomass usage could remove up to 5.5 billion tons CO2
“A study we did is on the order of two and a half to five and a half billion tons of CO₂ could be removed by just using that waste.”
Friedmann: California has 100 million dead trees suitable for biowaste use
“In California, because in part of climate change and other things, we have a hundred million dead trees, that's pretty concentrated bunch of dead trees, so you can actually think about how to use that.”
Friedmann: Central Valley food processing pre-aggregates large agricultural waste volumes
“In things like the Central Valley of California, again, we actually have a lot of concentrated agricultural wastes from where the food is processed, so the food may be gathered like almond pits or husks or something like that, but when they're processed, they'…”
Friedmann: Biowastes are far more concentrated than raw biomass feedstocks
“Even though biomass is broadly distributed, bio-wastes are actually more concentrated, and so that creates an opportunity for us.”
Friedmann: Waste biomass supply is sufficient for bankable 10-year offtake contracts
“In the near term, I'm less worried about the biomass supply, but I'm, I do mean that in the near term, in like the next 10 years or so. I think it's possible to put together long-term offtakes, that it's possible for those long-term offtakes to really be focus…”
Friedmann: About 6% of Germany's electricity comes from biomass gasification
“They do that today in Germany. About six percent of the electricity is generated by biomass in a gasifier to syngas to a turbine.”
Friedmann: Lancaster, California runs its municipal operations entirely on waste biomass
“City of Lancaster in California is running the entire city on waste biomass. They're putting it into a plasma gasifier, and they're running their trucks, and they're running their power systems, and they're running their heating entirely on waste biomass.”
Friedmann: Governments will soon mandate priority uses for biomass, disrupting contracts
“Pretty soon, there's gonna be some loading order priority, which a government, a municipal government, or a state government, or a federal government, comes out and says, you know, first use of biomass is for X, second use of biomass is for Y. And when that ha…”
Friedmann: Waste Biomass Is Sufficient to Scale SAF Without Hitting Limits
“We do need huge volumes of biomass to make huge volumes of sustainable aviation fuel. But in point of fact, there is way more waste biomass than that. So we're not going to hit the limit just on sustainable aviation fuel.”
Friedmann: Europe's sustainable aviation fuel push risks deforestation and eco-colonialism
“So there's a risk that by Europe going forward fast on sustainable aviation fuels that may lead to eco-colonialism or may lead to deforestation and bad outcomes, even though they're chasing something virtuous.”
Friedmann: Biomass is more valuable for carbon removal than energy generation
“Biomass is pretty crappy energy, but pretty good carbon. So, At almost any reasonable carbon price, it is more valuable to remove the CO₂ than turn it into energy. That carbon removal is actually more valuable than most energy products.”
Friedmann: At $60-$120/ton CO2, burying biomass beats energy conversion
“For some of these systems, it's like, 60 dollars a ton. It's just cheaper to bury the carbon instead of making something. And at a carbon price of, say, a hundred bucks or a 120 bucks, that's pretty much everything.”
Friedmann: The bioplastics market is too small to impact climate change
“So the entire plastics market is barely climate relevant. So if you're thinking about something that can deliver a big climate solution, bioplastics isn't it. You cannot balance the atmosphere's needs on making yoga pants and hoodies.”
Friedmann: Lack of global standards impedes biomass commodity exchanges
“Ultimately, though, we are going to need to have some kind of global standards For sustainable biomass, we don't have those yet, which makes it a little hard to have, you know, global commodities exchanges on it because we're still not quite sure we're talking…”