Matthew Gidden
@gidden.bsky.social
Scientist studying climate & energy and lover of disc sports. Research Professor @ctrglobsust.bsky.social. Senior Research Scholar @IIASA.ac.at. Personal account; Views are my own.
2️⃣ : The 4th International Conference on #CDR (formerly International Conference on Negative Emissions) will be hosted by CMCC in Milan 🇮🇹 .
negativeco2emissions2026.com/call-for-abs...
❗ Deadline: 30 January 2026
negativeco2emissions2026.com/call-for-abs...
❗ Deadline: 30 January 2026
Call for Abstracts – Negative CO2 Emission 2026
negativeco2emissions2026.com
January 7, 2026 at 4:12 PM
2️⃣ : The 4th International Conference on #CDR (formerly International Conference on Negative Emissions) will be hosted by CMCC in Milan 🇮🇹 .
negativeco2emissions2026.com/call-for-abs...
❗ Deadline: 30 January 2026
negativeco2emissions2026.com/call-for-abs...
❗ Deadline: 30 January 2026
1️⃣ : Do you have research on the potentials, limits, or risks of using CDR in climate mitigation strategies? Then submit your work to our upcoming #EGU session.
www.egu26.eu/session/56943
❗ Deadline: 15 January 2026, 13:00 CET.
Convening w/ @nadinemengis.bsky.social @felixschenuit.bsky.social
www.egu26.eu/session/56943
❗ Deadline: 15 January 2026, 13:00 CET.
Convening w/ @nadinemengis.bsky.social @felixschenuit.bsky.social
Session CL3.2.8
www.egu26.eu
January 7, 2026 at 4:12 PM
1️⃣ : Do you have research on the potentials, limits, or risks of using CDR in climate mitigation strategies? Then submit your work to our upcoming #EGU session.
www.egu26.eu/session/56943
❗ Deadline: 15 January 2026, 13:00 CET.
Convening w/ @nadinemengis.bsky.social @felixschenuit.bsky.social
www.egu26.eu/session/56943
❗ Deadline: 15 January 2026, 13:00 CET.
Convening w/ @nadinemengis.bsky.social @felixschenuit.bsky.social
And the great teams at @iiasa.ac.at and @quantstack.bsky.social have gone even a step further generating amazing visuals of our results.
Check out cdr.apps.ece.iiasa.ac.at/story/pruden... to dive in!
Check out cdr.apps.ece.iiasa.ac.at/story/pruden... to dive in!
CDR Knowledge Hub
cdr.apps.ece.iiasa.ac.at
September 4, 2025 at 8:56 AM
And the great teams at @iiasa.ac.at and @quantstack.bsky.social have gone even a step further generating amazing visuals of our results.
Check out cdr.apps.ece.iiasa.ac.at/story/pruden... to dive in!
Check out cdr.apps.ece.iiasa.ac.at/story/pruden... to dive in!
This kind of work requires an interdisciplinary team of experts, and it was my pleasure to work closely with many excellent coauthors including @joerirogelj.bsky.social @carlschleussner.bsky.social @mirandaboe.bsky.social among many others
September 4, 2025 at 8:56 AM
This kind of work requires an interdisciplinary team of experts, and it was my pleasure to work closely with many excellent coauthors including @joerirogelj.bsky.social @carlschleussner.bsky.social @mirandaboe.bsky.social among many others
What our study makes clear: we will need carbon storage at scale to achieve the long-term goal of the #ParisAgreement, but we need to manage it wisely. Reducing emissions as fast as possible today is the clearest and best strategy to avoid saddling future generations with unmanageable risks.
September 4, 2025 at 8:56 AM
What our study makes clear: we will need carbon storage at scale to achieve the long-term goal of the #ParisAgreement, but we need to manage it wisely. Reducing emissions as fast as possible today is the clearest and best strategy to avoid saddling future generations with unmanageable risks.
How are national energy and climate planners expecting to utilize it and over what time scales?
We suggest a best practice that countries make explicit their planned use of carbon storage in their climate plans as part of their commitments to the #ParisAgreement - especially in the run up to #COP30
We suggest a best practice that countries make explicit their planned use of carbon storage in their climate plans as part of their commitments to the #ParisAgreement - especially in the run up to #COP30
September 4, 2025 at 8:56 AM
How are national energy and climate planners expecting to utilize it and over what time scales?
We suggest a best practice that countries make explicit their planned use of carbon storage in their climate plans as part of their commitments to the #ParisAgreement - especially in the run up to #COP30
We suggest a best practice that countries make explicit their planned use of carbon storage in their climate plans as part of their commitments to the #ParisAgreement - especially in the run up to #COP30
Which countries, which sectors, and which generations can stake claim to this incredibly valuable resource?
We argue carbon storage should be treated as a scarce #intergenerational resource that needs to be managed properly today and essentially forever.
We argue carbon storage should be treated as a scarce #intergenerational resource that needs to be managed properly today and essentially forever.
September 4, 2025 at 8:56 AM
Which countries, which sectors, and which generations can stake claim to this incredibly valuable resource?
We argue carbon storage should be treated as a scarce #intergenerational resource that needs to be managed properly today and essentially forever.
We argue carbon storage should be treated as a scarce #intergenerational resource that needs to be managed properly today and essentially forever.
This has strong implications for how we establish and regulate #carbon #markets that result in a net-negative future rather than prolonging intrenched #fossil interests and business practices. A mix of policy and market forces are needed to generate more revenue from storing CO2 than emitting it.
September 4, 2025 at 8:56 AM
We find that profound shifts are needed in firm incentives for extracting and storing CO2. The countries and industries with the most know-how and capacity for storage carbon are the same as those who currently take it out of the ground.
September 4, 2025 at 8:56 AM
We find that profound shifts are needed in firm incentives for extracting and storing CO2. The countries and industries with the most know-how and capacity for storage carbon are the same as those who currently take it out of the ground.
Critically, we find that robust, safe carbon storage is inequitably distributed amongst countries. Those with the largest storage volumes tend to also those most responsible for current emissions.
www.nature.com/articles/s41...
www.nature.com/articles/s41...
Fig. 4: Prudent carbon-storage potential is unequally distributed among countries. | Nature
www.nature.com
September 4, 2025 at 8:56 AM
Critically, we find that robust, safe carbon storage is inequitably distributed amongst countries. Those with the largest storage volumes tend to also those most responsible for current emissions.
www.nature.com/articles/s41...
www.nature.com/articles/s41...
By the end of the century, some scenarios already breach our proposed prudent limit of geologic carbon storage
When we extrapolate scenarios beyond 2100, we find almost all would breach this limit by 2200
www.nature.com/articles/s41...
When we extrapolate scenarios beyond 2100, we find almost all would breach this limit by 2200
www.nature.com/articles/s41...
Fig. 3: Geologic carbon storage in scenarios exceed the prudent planetary limit. | Nature
www.nature.com
September 4, 2025 at 8:56 AM
By the end of the century, some scenarios already breach our proposed prudent limit of geologic carbon storage
When we extrapolate scenarios beyond 2100, we find almost all would breach this limit by 2200
www.nature.com/articles/s41...
When we extrapolate scenarios beyond 2100, we find almost all would breach this limit by 2200
www.nature.com/articles/s41...
More reasons to avoid overconfidence in temperature overshoot, as highlighted by @carlschleussner.bsky.social and colleagues: www.nature.com/articles/s41...
Overconfidence in climate overshoot - Nature
Aiming for declining global temperatures can limit long-term climate risks compared with a mere stabilization of global warming, including sea-level rise and cryosphere changes.
www.nature.com
September 4, 2025 at 8:56 AM
More reasons to avoid overconfidence in temperature overshoot, as highlighted by @carlschleussner.bsky.social and colleagues: www.nature.com/articles/s41...
A key finding of our analysis: if we were to use the most durable carbon storage available to us for #CDR in order to draw temperature down after an #overshoot of #1p5C (where we are headed at full speed), we could at most bring temperatures down by 0.7C
September 4, 2025 at 8:56 AM
A key finding of our analysis: if we were to use the most durable carbon storage available to us for #CDR in order to draw temperature down after an #overshoot of #1p5C (where we are headed at full speed), we could at most bring temperatures down by 0.7C
We find a prudent planteary limit for CO2 storage of 1460 Gt CO2, almost 10x less than our assessed technical potential of 11,800 Gt CO2 - which is in line with previous studies
Our dataset is built on open data, we provide gridded and spatially explicit maps.
www.nature.com/articles/s41...
Our dataset is built on open data, we provide gridded and spatially explicit maps.
www.nature.com/articles/s41...
Fig. 2: Storage potential loss due to application of different risk layers. | Nature
www.nature.com
September 4, 2025 at 8:56 AM
We find a prudent planteary limit for CO2 storage of 1460 Gt CO2, almost 10x less than our assessed technical potential of 11,800 Gt CO2 - which is in line with previous studies
Our dataset is built on open data, we provide gridded and spatially explicit maps.
www.nature.com/articles/s41...
Our dataset is built on open data, we provide gridded and spatially explicit maps.
www.nature.com/articles/s41...
We estimate storage volume outside of:
- human settlements
- environmentally protected areas
- seismically active areas
- areas precluded by treaties
- risk limits for re-releasing CO2
www.nature.com/articles/s41...
- human settlements
- environmentally protected areas
- seismically active areas
- areas precluded by treaties
- risk limits for re-releasing CO2
www.nature.com/articles/s41...
Fig. 1: Spatially explicit global carbon-storage potential in sedimentary basins. | Nature
www.nature.com
September 4, 2025 at 8:56 AM
We estimate storage volume outside of:
- human settlements
- environmentally protected areas
- seismically active areas
- areas precluded by treaties
- risk limits for re-releasing CO2
www.nature.com/articles/s41...
- human settlements
- environmentally protected areas
- seismically active areas
- areas precluded by treaties
- risk limits for re-releasing CO2
www.nature.com/articles/s41...
Working with a inderdisciplinary team of experrs in climate science, geology, petroleum engineering, and social science, we ask: where can we reliably, safely, practically and prudently store carbon for millienia?
September 4, 2025 at 8:56 AM
Working with a inderdisciplinary team of experrs in climate science, geology, petroleum engineering, and social science, we ask: where can we reliably, safely, practically and prudently store carbon for millienia?
Highlights:
- new risk-based assessment of CO2 storage potential consistent with #UNFCCC
- a cap on how much we can #overshoot the #1p5 limit of the Paris Agreement
- most #IPCC scenarios breach the limit by 2200
- clear country winners and losers
- all data open access: zenodo.org/records/1565...
- new risk-based assessment of CO2 storage potential consistent with #UNFCCC
- a cap on how much we can #overshoot the #1p5 limit of the Paris Agreement
- most #IPCC scenarios breach the limit by 2200
- clear country winners and losers
- all data open access: zenodo.org/records/1565...
Supplemental Data for Gidden et al 2025: A prudent planetary limit for geologic carbon storage
Below are table captions used in the supplementary data of the manuscript: Table S1. Global storage volumes considering each geospatial risk consideration layer sequentially, starting from the total...
zenodo.org
September 4, 2025 at 8:56 AM
Highlights:
- new risk-based assessment of CO2 storage potential consistent with #UNFCCC
- a cap on how much we can #overshoot the #1p5 limit of the Paris Agreement
- most #IPCC scenarios breach the limit by 2200
- clear country winners and losers
- all data open access: zenodo.org/records/1565...
- new risk-based assessment of CO2 storage potential consistent with #UNFCCC
- a cap on how much we can #overshoot the #1p5 limit of the Paris Agreement
- most #IPCC scenarios breach the limit by 2200
- clear country winners and losers
- all data open access: zenodo.org/records/1565...