Freya Chay
@freyachay.bsky.social
Thinking about carbon removal at @CarbonPlan.org
We have a lot to learn about carbon removal, and we need to learn fast. Open science can help. I’m excited to share CDRXIV, a new platform for early-stage CDR research. Take a look — and if you're working on CDR, consider sharing your work: cdrxiv.org
May 14, 2025 at 4:30 PM
We have a lot to learn about carbon removal, and we need to learn fast. Open science can help. I’m excited to share CDRXIV, a new platform for early-stage CDR research. Take a look — and if you're working on CDR, consider sharing your work: cdrxiv.org
Reposted by Freya Chay
Climate change is happening quickly. Solutions research needs to move at a speed that meets the challenge. We're launching @cdrxiv.org, a new preprint server for CDR research, because transparency and collaboration help move the field forward. Let’s make better CDR, together: cdrxiv.org
CDRXIV
CDRXIV is a new open access platform for sharing preprints and data related to carbon dioxide removal (CDR).
cdrxiv.org
May 14, 2025 at 1:49 PM
Climate change is happening quickly. Solutions research needs to move at a speed that meets the challenge. We're launching @cdrxiv.org, a new preprint server for CDR research, because transparency and collaboration help move the field forward. Let’s make better CDR, together: cdrxiv.org
Reposted by Freya Chay
Want to know how fossil fuel companies use carbon offsets to claim they’re fighting climate change?
We've updated OffsetsDB — our offsets database — to allow you to search by carbon credit user. Search "Shell" and see what offsets they're using and when. (1/4) carbonplan.org/research/off...
We've updated OffsetsDB — our offsets database — to allow you to search by carbon credit user. Search "Shell" and see what offsets they're using and when. (1/4) carbonplan.org/research/off...
April 23, 2025 at 6:18 PM
Want to know how fossil fuel companies use carbon offsets to claim they’re fighting climate change?
We've updated OffsetsDB — our offsets database — to allow you to search by carbon credit user. Search "Shell" and see what offsets they're using and when. (1/4) carbonplan.org/research/off...
We've updated OffsetsDB — our offsets database — to allow you to search by carbon credit user. Search "Shell" and see what offsets they're using and when. (1/4) carbonplan.org/research/off...
Reposted by Freya Chay
A Framework for Integrating Spatial Uncertainty into Critical Zone Models: Application to Enhanced Weathering. cdrxiv.org/preprint/334
A Framework for Integrating Spatial Uncertainty into Critical Zone Models: Application to Enhanced Weathering – CDRXIV
Spatial heterogeneity introduces uncertainty when characterizing the Critical Zone, especially when sampling is sparse or requires repeated measurements at the same locations. Here, we layout a probab...
cdrxiv.org
March 12, 2025 at 6:30 PM
A Framework for Integrating Spatial Uncertainty into Critical Zone Models: Application to Enhanced Weathering. cdrxiv.org/preprint/334
Reposted by Freya Chay
Limited impact on oysters in first-of-its-kind field trial of marine carbon dioxide removal (mCDR) strategy. cdrxiv.org/preprint/326
Limited impact on oysters in first-of-its-kind field trial of marine carbon dioxide removal (mCDR) strategy – CDRXIV
Carbon dioxide removal (CDR) is a necessary component of limiting global warming to 2°C by 2100. Marine enhanced rock weathering (mERW) with minerals like olivine is a CDR strategy with the potential ...
cdrxiv.org
January 24, 2025 at 4:29 PM
Limited impact on oysters in first-of-its-kind field trial of marine carbon dioxide removal (mCDR) strategy. cdrxiv.org/preprint/326
Reposted by Freya Chay
Photosynthesis in Rivers as a Loss Pathway for ERW-Derived DIC and Alkalinity. cdrxiv.org/preprint/329
Photosynthesis in Rivers as a Loss Pathway for ERW-Derived DIC and Alkalinity – CDRXIV
As climate mitigation efforts lag, dependence on anthropogenic CO2 removal increases. Enhanced rock weathering (ERW) is a rapidly growing CO2 removal approach. In terrestrial ERW, crushed rocks are sp...
cdrxiv.org
February 12, 2025 at 8:30 PM
Photosynthesis in Rivers as a Loss Pathway for ERW-Derived DIC and Alkalinity. cdrxiv.org/preprint/329
Reposted by Freya Chay
Assessing CO2 fluxes during enhanced weathering from soils through a mesocosm lens. cdrxiv.org/preprint/331
Assessing CO2 fluxes during enhanced weathering from soils through a mesocosm lens – CDRXIV
It is becoming increasingly accepted that annual gigatonne-scale CO2 removal, in conjunction with rapid decarbonization, is necessary to meet international climate goals and limit global warming below...
cdrxiv.org
March 4, 2025 at 7:45 PM
Assessing CO2 fluxes during enhanced weathering from soils through a mesocosm lens. cdrxiv.org/preprint/331
Reposted by Freya Chay
A year ago @freyachay.bsky.social and I started a big community debate with a piece suggesting that corn ethanol with CCS should not be considered carbon removal.
In a new piece today we try and cut through the debate, arguing that "what is CDR" is the wrong question to ask: carbonplan.org/resea...
In a new piece today we try and cut through the debate, arguing that "what is CDR" is the wrong question to ask: carbonplan.org/resea...
“What is CDR?” is the wrong question – CarbonPlan
We summarize the ongoing debate around what “counts” as CDR, highlighting the trade-offs of each proposed definition. We suggest an alternative set of questions that can provide a more meaningful guide to making effective CDR investments.
carbonplan.org
February 25, 2025 at 8:38 PM
A year ago @freyachay.bsky.social and I started a big community debate with a piece suggesting that corn ethanol with CCS should not be considered carbon removal.
In a new piece today we try and cut through the debate, arguing that "what is CDR" is the wrong question to ask: carbonplan.org/resea...
In a new piece today we try and cut through the debate, arguing that "what is CDR" is the wrong question to ask: carbonplan.org/resea...
Reposted by Freya Chay
There’s an ongoing debate over what should “count” as CO₂ removal. In a new commentary with @hausfath.bsky.social, we break down key points of contention, proposed definitions, and why no definition offers a perfect path forward. (1/5)
carbonplan.org/research/def...
carbonplan.org/research/def...
“What is CDR?” is the wrong question – CarbonPlan
We summarize the ongoing debate around what “counts” as CDR, highlighting the trade-offs of each proposed definition. We suggest an alternative set of questions that can provide a more meaningful guid...
carbonplan.org
February 25, 2025 at 7:11 PM
There’s an ongoing debate over what should “count” as CO₂ removal. In a new commentary with @hausfath.bsky.social, we break down key points of contention, proposed definitions, and why no definition offers a perfect path forward. (1/5)
carbonplan.org/research/def...
carbonplan.org/research/def...
Reposted by Freya Chay
What ever happened to transparency in solar geoengineering research?
a 🧵 of reflections on our new opinion article in PNAS
www.pnas.org/doi/10.1073/...
a 🧵 of reflections on our new opinion article in PNAS
www.pnas.org/doi/10.1073/...
How to address solar geoengineering’s transparency problem | PNAS
How to address solar geoengineering’s transparency problem
www.pnas.org
January 17, 2025 at 7:02 PM
What ever happened to transparency in solar geoengineering research?
a 🧵 of reflections on our new opinion article in PNAS
www.pnas.org/doi/10.1073/...
a 🧵 of reflections on our new opinion article in PNAS
www.pnas.org/doi/10.1073/...
Reposted by Freya Chay
Just had a sample of the Eaton Fire ash that is in my driveway run on the department XRF. Is there titanium (new house paint)? Yup. Lead (old house paint)? You betcha. Heavy metals? Check. Treat that ash like it's toxic folks (because it is)
January 17, 2025 at 7:49 PM
Just had a sample of the Eaton Fire ash that is in my driveway run on the department XRF. Is there titanium (new house paint)? Yup. Lead (old house paint)? You betcha. Heavy metals? Check. Treat that ash like it's toxic folks (because it is)
Reposted by Freya Chay
A group of current and former members of the expert panel of the carbon crediting industry's self-regulatory body, the ICVCM, have a post objecting to the ICVCM's approval of three tropical forest carbon REDD methodologies.
A very timely and important read:
www.oeko.de/blog/the-icv...
A very timely and important read:
www.oeko.de/blog/the-icv...
The ICVCM approval of three REDD methodologies presents risks to the integrity of the initiative
In November 2024, the Governing Board of the Integrity Council for the Voluntary Carbon Market (ICVCM) approved three methodologies for reducing emissions from deforestation and forest degradation (RE...
www.oeko.de
December 10, 2024 at 6:00 PM
A group of current and former members of the expert panel of the carbon crediting industry's self-regulatory body, the ICVCM, have a post objecting to the ICVCM's approval of three tropical forest carbon REDD methodologies.
A very timely and important read:
www.oeko.de/blog/the-icv...
A very timely and important read:
www.oeko.de/blog/the-icv...
Reposted by Freya Chay
Hey people working on marine CO₂ removal (mCDR), post your preprints to CDRXIV (pronounced C-D Archive). 🌊
Carbon Dioxide Removal research needs a central, multidisciplinary hub. We’re building it at cdrxiv.org. Read and download others' work, explore CDR pathways and topics, and help the platform grow by submitting your CDR research!
CDRXIV
CDRXIV is a new open access platform for sharing preprints and data related to carbon dioxide removal (CDR).
cdrxiv.org
December 7, 2024 at 5:50 PM
Hey people working on marine CO₂ removal (mCDR), post your preprints to CDRXIV (pronounced C-D Archive). 🌊
Reposted by Freya Chay
An All-Star roster of climate scientists cleared their throats recently and it was something to behold.
Their message to Net-Zero experts in every sector?
You're Doing It Wrong 🧪
www.bloomberg.com/news/article...
Their message to Net-Zero experts in every sector?
You're Doing It Wrong 🧪
www.bloomberg.com/news/article...
Scientists Behind ‘Net Zero’ Concept Say Nations Are Getting It Wrong
In a new study, high-profile climate scientists say countries are using flawed carbon accounting by relying too heavily on trees and oceans to absorb new carbon emissions.
www.bloomberg.com
December 5, 2024 at 5:24 PM
An All-Star roster of climate scientists cleared their throats recently and it was something to behold.
Their message to Net-Zero experts in every sector?
You're Doing It Wrong 🧪
www.bloomberg.com/news/article...
Their message to Net-Zero experts in every sector?
You're Doing It Wrong 🧪
www.bloomberg.com/news/article...
Reposted by Freya Chay
Ok, first train+decarb content of the day returns me to the first climate project I ever worked on: How to appropriately dispose of fossil assets that are decommissioned before end of life. It's a puzzle that's becoming ubiquitous, but mostly flying under the radar.🔌💡(1/20)
December 5, 2024 at 9:44 PM
Ok, first train+decarb content of the day returns me to the first climate project I ever worked on: How to appropriately dispose of fossil assets that are decommissioned before end of life. It's a puzzle that's becoming ubiquitous, but mostly flying under the radar.🔌💡(1/20)
Reposted by Freya Chay
A veritable whos-who of the scientists behind our physical climate understanding of net-zero have a new paper in Nature, making the case for "Geological Net Zero" where fossil CO2 can only credibly counterbalanced by permanent removal: www.nature.com/artic...
November 19, 2024 at 6:00 PM
A veritable whos-who of the scientists behind our physical climate understanding of net-zero have a new paper in Nature, making the case for "Geological Net Zero" where fossil CO2 can only credibly counterbalanced by permanent removal: www.nature.com/artic...
Reposted by Freya Chay
In January, AB1305 will start requiring California companies to report which offsets they use. A few have already started making these disclosures, revealing big challenges — data is hard to find, often incomplete, and tough to analyze. Read our recommendations: 🧪
carbonplan.org/research/ab1...
carbonplan.org/research/ab1...
Analyzing initial offset disclosures under California’s AB1305 – CarbonPlan
Early disclosures demonstrate the power of transparency, but also highlight the opportunity for improvements around discoverability and usability.
carbonplan.org
October 30, 2024 at 8:43 PM
In January, AB1305 will start requiring California companies to report which offsets they use. A few have already started making these disclosures, revealing big challenges — data is hard to find, often incomplete, and tough to analyze. Read our recommendations: 🧪
carbonplan.org/research/ab1...
carbonplan.org/research/ab1...
Reposted by Freya Chay
What if you could click anywhere in the ocean and figure out where released alkalinity would go, how much it would change surface ocean pCO₂, and how much carbon dioxide removal (CDR) you would get? Now there's a way, from @cworthy.bsky.social and CarbonPlan. 🌊
carbonplan.org/research/oae...
carbonplan.org/research/oae...
October 15, 2024 at 10:53 PM
What if you could click anywhere in the ocean and figure out where released alkalinity would go, how much it would change surface ocean pCO₂, and how much carbon dioxide removal (CDR) you would get? Now there's a way, from @cworthy.bsky.social and CarbonPlan. 🌊
carbonplan.org/research/oae...
carbonplan.org/research/oae...
Reposted by Freya Chay
We're looking for a Senior Software Engineer at @cworthy.bsky.social to help build a system to support standardization of carbon removal accounting and environmental impact assessments related to deployments of marine carbon dioxide removal (mCDR) technologies.
Please share with your network. 🌊🧪
Please share with your network. 🌊🧪
Convergent Research - Senior Software Engineer
[C]Worthy is building a software system – called C-Star – to support standardization of carbon removal accounting and environmental impact assessments related to deployments of marine carbon dioxide r...
jobs.lever.co
October 6, 2024 at 10:11 PM
We're looking for a Senior Software Engineer at @cworthy.bsky.social to help build a system to support standardization of carbon removal accounting and environmental impact assessments related to deployments of marine carbon dioxide removal (mCDR) technologies.
Please share with your network. 🌊🧪
Please share with your network. 🌊🧪
Reposted by Freya Chay
“These tech giants are poised to become some of the biggest energy users of the future…Ahead of that, they are working behind the scenes to shape a once-in-a-decade rewrite of the rules governing how pollution from power use is disclosed.”
www.ft.com/content/2d6f...
www.ft.com/content/2d6f...
How Big Tech is quietly trying to reshape how pollution is reported
Critics say a proposed rule change backed by Amazon and Meta could allow large energy users to hide their true emissions
www.ft.com
August 14, 2024 at 6:30 AM
“These tech giants are poised to become some of the biggest energy users of the future…Ahead of that, they are working behind the scenes to shape a once-in-a-decade rewrite of the rules governing how pollution from power use is disclosed.”
www.ft.com/content/2d6f...
www.ft.com/content/2d6f...
Reposted by Freya Chay
We also aren’t the only people concerned about the lack of transparency in private climate risk prediction. Bloomberg also published a feature today that also found differences between companies in an analysis independent from ours. (8/8) www.bloomberg.com/graphics/202...
The Risky Business of Predicting Where Climate Disaster Will Hit
Climate tech companies can calculate the chances that a flood or wildfire will ravage your home. But what if their odds are all different?
www.bloomberg.com
August 9, 2024 at 6:17 PM
We also aren’t the only people concerned about the lack of transparency in private climate risk prediction. Bloomberg also published a feature today that also found differences between companies in an analysis independent from ours. (8/8) www.bloomberg.com/graphics/202...
Reposted by Freya Chay
Enhanced rock weathering is a carbon removal technique gaining lots of attention, but we’re still figuring out best ways to do it. In collab with @climatejesper.bsky.social, we synthesized scientific results to explain what we know, and grapple with what we don’t. carbonplan.org/research/enh...
Does enhanced weathering work? We’re still learning. – CarbonPlan
A synthesis of carbon removal estimates from the enhanced weathering literature.
carbonplan.org
March 19, 2024 at 3:20 PM
Enhanced rock weathering is a carbon removal technique gaining lots of attention, but we’re still figuring out best ways to do it. In collab with @climatejesper.bsky.social, we synthesized scientific results to explain what we know, and grapple with what we don’t. carbonplan.org/research/enh...
Reposted by Freya Chay
Carbon credits are everywhere, but the data about where they come is hard to track down and difficult to work with.
OffsetsDB is a new database that collects, standardizes, and provides daily updates of offset project data from five of the largest registries.
carbonplan.org/research/off...
OffsetsDB is a new database that collects, standardizes, and provides daily updates of offset project data from five of the largest registries.
carbonplan.org/research/off...
OffsetsDB – CarbonPlan
A harmonized database of carbon offset projects and credits.
carbonplan.org
March 11, 2024 at 2:23 PM
Carbon credits are everywhere, but the data about where they come is hard to track down and difficult to work with.
OffsetsDB is a new database that collects, standardizes, and provides daily updates of offset project data from five of the largest registries.
carbonplan.org/research/off...
OffsetsDB is a new database that collects, standardizes, and provides daily updates of offset project data from five of the largest registries.
carbonplan.org/research/off...
Reposted by Freya Chay
I wrote a pair of short blog posts on the climate value of temporary carbon storage, now available at the Kleinman Center for Energy Policy at Penn.
Part 1 explains why temporary offsets are *not* equivalent to the permanent harms of CO2 emissions.
Part 1 explains why temporary offsets are *not* equivalent to the permanent harms of CO2 emissions.
Why Temporary Carbon Storage in Forests Has Little Climate Value: Part 1 - Kleinman Center for Energ...
Energy policy research from the University of Pennsylvania
kleinmanenergy.upenn.edu
December 13, 2023 at 8:47 PM
I wrote a pair of short blog posts on the climate value of temporary carbon storage, now available at the Kleinman Center for Energy Policy at Penn.
Part 1 explains why temporary offsets are *not* equivalent to the permanent harms of CO2 emissions.
Part 1 explains why temporary offsets are *not* equivalent to the permanent harms of CO2 emissions.
Reposted by Freya Chay
Earlier this year I (with Frances Sawyer) published a paper suggesting the 45Q CCS tax credit is structured in a way that could incentivize huge costs + increased GHG emissions from the US power sector.
DOE rebutted it, and we were allowed to reply. Those pieces are up today:
DOE rebutted it, and we were allowed to reply. Those pieces are up today:
Reply to 'A commentary on "US power sector carbon capture and storage under the Inflation Reduction ...
iopscience.iop.org
December 4, 2023 at 4:27 PM
Earlier this year I (with Frances Sawyer) published a paper suggesting the 45Q CCS tax credit is structured in a way that could incentivize huge costs + increased GHG emissions from the US power sector.
DOE rebutted it, and we were allowed to reply. Those pieces are up today:
DOE rebutted it, and we were allowed to reply. Those pieces are up today: