Reviewer 2 does geoengineering

In this episode, @geoengineering1 speaks with Ahmed El-Sayed of Viridas Technologies, a company aiming to revolutionize Direct Air Capture (DAC) by redesigning the process from the ground up, including the fan system itself. The conversation explores why DAC remains expensive, largely due to the extremely low concentration of CO2 in ambient air. While most research focuses on developing new solven...

@geoengineering1 interviews Rudolf Wessels, Director of Technology and Innovation at Avantium R&D Solutions in the Netherlands (founded in 2000 as a Shell spin-out). The discussion examines Avantium’s contribution to advancing Direct Air Capture (DAC) through high-throughput experimentation platforms designed to accelerate the discovery and optimization of sorbent materials, enabling rapid, pa...

@geoengineering1 interviews Cory Sanderson, CTO and co-founder of Sustaera, a North Carolina-based Direct Air Capture (DAC) startup focused on low-cost carbon capture, separations chemistry, and process scale-up. Sanderson traces his journey from Air Products, where he worked on vacuum swing adsorption CO₂ capture for an SMR hydrogen plant and encountered economic and infrastructure constraints, t...

@geoengineering1 interviews Paolo Piffaretti, co-founder of ClimeFi (https://www.climefi.com/), on how durable carbon dioxide removal (CDR) credits are verified and delivered for corporate buyers. ClimeFi acts as a buyer-side agent, helping organizations define contribution vs. compensation goals, run reverse-auction RFPs, build diversified portfolios, conduct due diligence, negotiate contracts wi...

In this episode, @geoengineering1 is joined by Britta Clark, a postdoctoral researcher at Harvard University, to unpack why solar geoengineering is increasingly compared to opioids. They discuss how this framing casts SRM as temporary “relief” from climate warming and why it raises concerns about potentially slowing emissions cuts. The conversation focuses on how climate models, policy debates, an...

In this episode, @geoengineering1 interviews Athar Hussain, physicist and professor of atmospheric science at COMSATS University, Pakistan, about his recent study examining how SAI could influence malaria transmission across South Asia. Using the VECTRI malaria model, the research compares an unmitigated high-emissions pathway (RCP8.5) with the GLENS-SAI scenario, which stabilizes global temperatu...

@geoengineering1 interviews Paul Gambill to discuss the intricate dynamics between adaptation and geoengineering. Drawing on his experience as the former founder of Nori, the first carbon removal marketplace, Paul reflects on why scaling durable carbon removal has proven so difficult and what those barriers suggest for stabilizing the climate in an era of overshoot. The conversation then turns to...

What could be more festive than carbon storage in snowy evergreen forests? @geoengineering1 interviews Kevin Bradley D'Souza, a postdoctoral researcher at the University of Waterloo, about the real climate potential of reforesting Boreal forests. Kevin explains the crucial role these forests play in carbon storage, biodiversity, and permafrost protection, while noting that reforestation in the Bor...

Miranda Hack provides an in-depth look at the often-overlooked engineering and logistical barriers to large-scale deployment of solid particles for stratospheric aerosol injection (SAI). She explains how dispersing sub-micron mineral particles at altitude, including challenges like agglomeration, complex nozzle flows, and supply-chain constraints, introduces significant uncertainties and costs. Th...

Roderick Hyde discusses his recent paper on using high-altitude hoses for solar geoengineering. While most proposals focus on aircraft delivery, Hyde revisits an older but largely dismissed concept. He describes suspending a 20 km hose by balloons to continuously pump sulfur-bearing fluids into the stratosphere, and argues that advances in modern materials and engineering may overcome past barrier...

John Moore joins the podcast to discuss his recent Viewpoint article responding to Siegert et al.’s paper on polar geoengineering. While Siegert and colleagues argue that proposed interventions are infeasible, environmentally dangerous, and a distraction from decarbonization, Moore contrasts the prevailing “consequences-based paradigm” (raising alarms to spur actions) with a new “compassionate har...

Jacob Bronsther & Yangyang Xu discuss their recent paper on the socioeconomic costs of Solar Radiation Modification. While SRM’s direct technical costs appear modest (~$18B/°C cooling), the authors argue that its broader costs are far greater. They estimate that Stratospheric Aerosol Injection could generate between $0 and $809 billion annually in side-effect harms, with potentially higher fig...

Brian Soden discusses his recent study on injecting absorptive aerosols, such as black carbon, into the upper stratosphere to weaken the CO₂ greenhouse effect. The conversation addresses the radiative physics underpinning this concept, its potential cooling efficiency relative to conventional scattering aerosols, and associated environmental risks. While model results indicate the method could the...

Daniel Bodansky discusses his recent article on the drawbacks of a global moratorium on solar radiation management deployment. The conversation critiques whether a moratorium is feasible or effective, arguing it could hinder critical research, be difficult to enforce, and unintentionally become a proxy for a permanent ban. Instead, the discussion highlights the need for more research and stronger...

Diego Villanueva discusses his paper on mixed-phase regime cloud thinning (MCT). This geoengineering approach involves using ice-nucleating particles to reduce the heat-trapping effects of polar clouds. Using climate and cloud-resolving models, the study finds MCT could offset up to 25% of polar ocean warming from CO₂ doubling and increase sea ice by 8% in the Arctic and 14% in Antarctica. In the...

@geoengineering1 interviews Fabien Bardinet, co-founder of CIRCEO [linkedin.com/company/circeocc], a new company focused on marine-based carbon capture. CIRCEO is developing semi-autonomous sailing drones that generate electricity from wind to power onboard electrochemical systems that remove carbon from seawater. The company is currently hiring a CDR Electrochemist Co-founder: linkedin.com/jobs/v...

Tyler Felgenhauer and @geoengineering1 discuss risk-risk trade-offs. Paper: Tyler Felgenhauer, Govindasamy Bala, Mark E Borsuk, Inés Camilloni, Jonathan B Wiener, Jianhua Xu, Practical paths to risk-risk analysis of solar radiation modification, Oxford Open Climate Change, Volume 5, Issue 1, 2025, kgaf012, https://doi.org/10.1093/oxfclm/kgaf012 Guest info: Tyler Felgenhauer, PhD; Senior Research S...

Jeffrey Nielsen and @geoengineering1 discuss how the strategic relationship between the US and China will interact with SRM. Paper: Jeffrey Nielsen, The big green button: stratospheric aerosol injection as a geopolitical dilemma during strategic competition between the United States and China, and implications for expanding aerosol injection near-term research, Oxford Open Climate Change, Volume 5...

Enrico Prats Salvado discusses the benefits and challenges of using the sun's heat for DAC desorb. Paper Prats-Salvado, E., Monnerie, N. & Sattler, C. Powering Direct Air Capture: Overview of Existing Concepts and the Overlooked Role of Concentrated Solar Thermal Technologies. Curr Sustainable Renewable Energy Rep 12, 8 (2025). https://doi.org/10.1007/s40518-025-00255-y

Claire Nelson, founder of Cella mineral storage, explains how underground injections of water alternating with CO2 might aid mineralsation. Paper: Water-alternating-gas injections for optimized mineral carbon storage in basalt https://www.sciencedirect.com/science/article/abs/pii/S1750583624002263 Poppin' Fresh, more widely known as the Pillsbury Doughboy, is also, rather randomly, discussed https...

Paul Reginato explains how biotech can be applied to CDR. Paper: Biotechnology in direct air capture, enhanced weathering, and methane removal: emerging opportunities and gaps. https://doi.org/10.3389/fclim.2024.1440833

Can we just throw carbon in the sea - like a mobile phone with incriminating evidence on? Brenna Boehman and Erica Dorr from Sinkco and Riverse come on to discuss their Marine Carbon Burial Methodology with @geoengineering1

Martin Freimüller introduces Octavia Carbon, explaining how they're making DAC work in Kenya's Great Rift Valley. Hosted by @geoengineering1

Smoggies Humbul (Suleman), Omar, and Faizan discuss their research detailed in this press release https://www.tees.ac.uk/sections/news/pressreleases_story.cfm?story_id=8651 It's a fancy form of hydrochar, pimped by chemical manipulation.

Can COVID policy be compared to geoengineering policy? Hosea Olayiwola Patrick discusses "Reflections on COVID-19 Adaptive Responses as a Template for Climate Intervention-Geoengineering Engagement" with @geoengineering1 https://www.preprints.org/manuscript/202501.1715/v1