Alaa Al Khourdajie
@dralaaclimate.bsky.social
Research Fellow @ImperialCollege | Lead Author @IPCC AR7, @WCRP HIETPs & @UNEP GEO7 | WP4 Lead @DIAMOND | Guest Scholar @IIASA | Dad
#Climate #Energy #Scenarios
https://sites.google.com/site/akhourdajie/
#Climate #Energy #Scenarios
https://sites.google.com/site/akhourdajie/
Pinned
🚨New Paper🚨"Science-based targets miss the mark" with @andyreisinger.bsky.social, Annette Cowie, Oliver Geden @natureportfolio.bsky.social - Comm Earth & Env #OpenAccess
In this perspective, we challenge the equity & ambition claims of science-based targets 🧵
nature.com/articles/s43...
1/20
In this perspective, we challenge the equity & ambition claims of science-based targets 🧵
nature.com/articles/s43...
1/20
Sadly, “for now”
Not that anybody asked, but the Northern Arctic is just Ocean. So Santa’s North Pole Workshop has only ever existed on a floating sheet of ice.
No fur trees.
No hills.
Occasional seals.
And polar bears — for now.
No fur trees.
No hills.
Occasional seals.
And polar bears — for now.
December 25, 2025 at 11:27 PM
Sadly, “for now”
Reposted by Alaa Al Khourdajie
On the 22nd day of our #PLOSClimateCountdown, we're featuring an Essay by @dralaaclimate.bsky.social:
"The role of Artificial Intelligence in climate change scientific assessments"
🔗 journals.plos.org/climate/arti...
"The role of Artificial Intelligence in climate change scientific assessments"
🔗 journals.plos.org/climate/arti...
December 22, 2025 at 9:07 AM
On the 22nd day of our #PLOSClimateCountdown, we're featuring an Essay by @dralaaclimate.bsky.social:
"The role of Artificial Intelligence in climate change scientific assessments"
🔗 journals.plos.org/climate/arti...
"The role of Artificial Intelligence in climate change scientific assessments"
🔗 journals.plos.org/climate/arti...
Reposted by Alaa Al Khourdajie
#NCAR is a leading institution in climate science. Climate science is not woke. It is the science that explains the evidence we have over the last few decades of an earth system that is stressed by anthropogenic interference.
December 18, 2025 at 1:49 AM
#NCAR is a leading institution in climate science. Climate science is not woke. It is the science that explains the evidence we have over the last few decades of an earth system that is stressed by anthropogenic interference.
Reposted by Alaa Al Khourdajie
[2/3] One in Futures on "Constructing futures through climate modelling", that I'm co-editing with @dralaaclimate.bsky.social, @natasja.bsky.social, @a-nikas.bsky.social and Chris Groves
Submission deadline for *papers* : March 31
www.sciencedirect.com/special-issu...
Submission deadline for *papers* : March 31
www.sciencedirect.com/special-issu...
Futures | ScienceDirect.com by Elsevier - Futures | ScienceDirect.com by Elsevier
Read the latest articles of Futures at ScienceDirect.com, Elsevier’s leading platform of peer-reviewed scholarly literature
www.sciencedirect.com
December 17, 2025 at 3:58 PM
[2/3] One in Futures on "Constructing futures through climate modelling", that I'm co-editing with @dralaaclimate.bsky.social, @natasja.bsky.social, @a-nikas.bsky.social and Chris Groves
Submission deadline for *papers* : March 31
www.sciencedirect.com/special-issu...
Submission deadline for *papers* : March 31
www.sciencedirect.com/special-issu...
Reposted by Alaa Al Khourdajie
Climate change, biodiversity loss, land degradation, and pollution are together claiming millions of lives and costing trillions of dollars every year, according to the most comprehensive assessment of the global environment ever undertaken 🧵
December 9, 2025 at 11:47 AM
Climate change, biodiversity loss, land degradation, and pollution are together claiming millions of lives and costing trillions of dollars every year, according to the most comprehensive assessment of the global environment ever undertaken 🧵
Here we go, @ipcc.bsky.social first lead author meeting (and for the first time ever covering all three working groups)
A mixed feeling of excitement and responsibility
A mixed feeling of excitement and responsibility
December 1, 2025 at 8:35 AM
Here we go, @ipcc.bsky.social first lead author meeting (and for the first time ever covering all three working groups)
A mixed feeling of excitement and responsibility
A mixed feeling of excitement and responsibility
Reposted by Alaa Al Khourdajie
#COP30: Imperial researchers react to ‘deeply disappointing’ climate talks
In the aftermath of the agreement, Imperial experts Dr Nathan Johnson, Dr Robin Lamboll, Prof Joeri Rogelj, Dr Alaa Al Khourdajie, Dr Emily Theokritoff and Dr Caterina Brandmayr have weighed in 🧵
ow.ly/9CSZ50XwZzs
In the aftermath of the agreement, Imperial experts Dr Nathan Johnson, Dr Robin Lamboll, Prof Joeri Rogelj, Dr Alaa Al Khourdajie, Dr Emily Theokritoff and Dr Caterina Brandmayr have weighed in 🧵
ow.ly/9CSZ50XwZzs
November 24, 2025 at 5:11 PM
#COP30: Imperial researchers react to ‘deeply disappointing’ climate talks
In the aftermath of the agreement, Imperial experts Dr Nathan Johnson, Dr Robin Lamboll, Prof Joeri Rogelj, Dr Alaa Al Khourdajie, Dr Emily Theokritoff and Dr Caterina Brandmayr have weighed in 🧵
ow.ly/9CSZ50XwZzs
In the aftermath of the agreement, Imperial experts Dr Nathan Johnson, Dr Robin Lamboll, Prof Joeri Rogelj, Dr Alaa Al Khourdajie, Dr Emily Theokritoff and Dr Caterina Brandmayr have weighed in 🧵
ow.ly/9CSZ50XwZzs
Reposted by Alaa Al Khourdajie
A lot of people are going to lose money on this. Solar radiation modification only makes sense if followed by large-scale carbon dioxide removal, and we ain't got that.
A 25-person startup is developing technology to block the sun and turn down the planet’s thermostat.
The stakes are huge — and the company and its critics say regulations need to catch up.
Read more: politi.co/4iaojIc
The stakes are huge — and the company and its critics say regulations need to catch up.
Read more: politi.co/4iaojIc
November 24, 2025 at 7:00 PM
A lot of people are going to lose money on this. Solar radiation modification only makes sense if followed by large-scale carbon dioxide removal, and we ain't got that.
Reposted by Alaa Al Khourdajie
Spent Saturday night reviewing the final #COP30 Belém draft text. A friend joked it counts as “light reading.”
Unfortunately, it is very much a light read.
1/
Unfortunately, it is very much a light read.
1/
November 22, 2025 at 11:32 PM
Spent Saturday night reviewing the final #COP30 Belém draft text. A friend joked it counts as “light reading.”
Unfortunately, it is very much a light read.
1/
Unfortunately, it is very much a light read.
1/
Spent Saturday night reviewing the final #COP30 Belém draft text. A friend joked it counts as “light reading.”
Unfortunately, it is very much a light read.
1/
Unfortunately, it is very much a light read.
1/
November 22, 2025 at 11:32 PM
Spent Saturday night reviewing the final #COP30 Belém draft text. A friend joked it counts as “light reading.”
Unfortunately, it is very much a light read.
1/
Unfortunately, it is very much a light read.
1/
Reposted by Alaa Al Khourdajie
As the final text is being hammered out here in Belém for #COP30, the issue of fossil fuel phase-out is on the table again.
Looking at the actual numbers from the IPCC AR6 1.5°C assessed scenarios to decompose reduced fossil fuel output vs. carbon capture and storage - CCS (i.e. abatement)
1/3
Looking at the actual numbers from the IPCC AR6 1.5°C assessed scenarios to decompose reduced fossil fuel output vs. carbon capture and storage - CCS (i.e. abatement)
1/3
November 21, 2025 at 7:10 PM
As the final text is being hammered out here in Belém for #COP30, the issue of fossil fuel phase-out is on the table again.
Looking at the actual numbers from the IPCC AR6 1.5°C assessed scenarios to decompose reduced fossil fuel output vs. carbon capture and storage - CCS (i.e. abatement)
1/3
Looking at the actual numbers from the IPCC AR6 1.5°C assessed scenarios to decompose reduced fossil fuel output vs. carbon capture and storage - CCS (i.e. abatement)
1/3
As the final text is being hammered out here in Belém for #COP30, the issue of fossil fuel phase-out is on the table again.
Looking at the actual numbers from the IPCC AR6 1.5°C assessed scenarios to decompose reduced fossil fuel output vs. carbon capture and storage - CCS (i.e. abatement)
1/3
Looking at the actual numbers from the IPCC AR6 1.5°C assessed scenarios to decompose reduced fossil fuel output vs. carbon capture and storage - CCS (i.e. abatement)
1/3
November 21, 2025 at 7:10 PM
As the final text is being hammered out here in Belém for #COP30, the issue of fossil fuel phase-out is on the table again.
Looking at the actual numbers from the IPCC AR6 1.5°C assessed scenarios to decompose reduced fossil fuel output vs. carbon capture and storage - CCS (i.e. abatement)
1/3
Looking at the actual numbers from the IPCC AR6 1.5°C assessed scenarios to decompose reduced fossil fuel output vs. carbon capture and storage - CCS (i.e. abatement)
1/3
Reposted by Alaa Al Khourdajie
Overshoot: returning to 1.5°C requires net-negative emissions targets. @swp-berlin.org policy brief with Oliver Geden.
Keeping 1.5 alive will require reframing “net-zero” as transitional stage towards net-negative GHG emissions rather than an endpoint, and policy instruments able to deliver this.
Keeping 1.5 alive will require reframing “net-zero” as transitional stage towards net-negative GHG emissions rather than an endpoint, and policy instruments able to deliver this.
Overshoot: Returning to 1.5°C Requires Net-negative Emissions Targets
Global warming is set to rise above 1.5°C by the early 2030s. Returning to 1.5°C before the end of the 21st century would not prevent all harms...
www.swp-berlin.org
November 19, 2025 at 10:21 AM
Overshoot: returning to 1.5°C requires net-negative emissions targets. @swp-berlin.org policy brief with Oliver Geden.
Keeping 1.5 alive will require reframing “net-zero” as transitional stage towards net-negative GHG emissions rather than an endpoint, and policy instruments able to deliver this.
Keeping 1.5 alive will require reframing “net-zero” as transitional stage towards net-negative GHG emissions rather than an endpoint, and policy instruments able to deliver this.
Reposted by Alaa Al Khourdajie
To be Paris Agreement compatible, the label 'abated fossil fuels' needs to apply to Carbon Capture and Storage applications with net-zero greenhouse gas emissions on a lifecycle basis.
This requires four things...🧵
ow.ly/j0lz50XsO8a
#COP30
This requires four things...🧵
ow.ly/j0lz50XsO8a
#COP30
November 17, 2025 at 2:15 PM
To be Paris Agreement compatible, the label 'abated fossil fuels' needs to apply to Carbon Capture and Storage applications with net-zero greenhouse gas emissions on a lifecycle basis.
This requires four things...🧵
ow.ly/j0lz50XsO8a
#COP30
This requires four things...🧵
ow.ly/j0lz50XsO8a
#COP30
Join our #COP30 event
“CCUS Myth-Busting Live: Ask the Experts”
Date and time Monday 17 November, 10:00–11:30 am local time (1:00-2:30pm UK time)
Location: UK Pavilion, Blue Zone (A23)
YouTube live stream: www.youtube.com/live/SjaW3Ob...
“CCUS Myth-Busting Live: Ask the Experts”
Date and time Monday 17 November, 10:00–11:30 am local time (1:00-2:30pm UK time)
Location: UK Pavilion, Blue Zone (A23)
YouTube live stream: www.youtube.com/live/SjaW3Ob...
November 13, 2025 at 1:05 PM
Join our #COP30 event
“CCUS Myth-Busting Live: Ask the Experts”
Date and time Monday 17 November, 10:00–11:30 am local time (1:00-2:30pm UK time)
Location: UK Pavilion, Blue Zone (A23)
YouTube live stream: www.youtube.com/live/SjaW3Ob...
“CCUS Myth-Busting Live: Ask the Experts”
Date and time Monday 17 November, 10:00–11:30 am local time (1:00-2:30pm UK time)
Location: UK Pavilion, Blue Zone (A23)
YouTube live stream: www.youtube.com/live/SjaW3Ob...
Reposted by Alaa Al Khourdajie
Do climate conferences actually achieve anything? A lot of people have strong opinions, but we wanted measurements, so we look at how the stock market moves during yearly international meetings called COPs – explanation below, or read the paper here:
iopscience.iop.org/article/10.1...
iopscience.iop.org/article/10.1...
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iopscience.iop.org
November 6, 2025 at 12:41 PM
Do climate conferences actually achieve anything? A lot of people have strong opinions, but we wanted measurements, so we look at how the stock market moves during yearly international meetings called COPs – explanation below, or read the paper here:
iopscience.iop.org/article/10.1...
iopscience.iop.org/article/10.1...
Reposted by Alaa Al Khourdajie
📈COP delivers stock market boost for ‘green’ companies but renewables unaffected, Imperial College London study shows 🧵
Read it here: ow.ly/o6xY50XnEuH
Read it here: ow.ly/o6xY50XnEuH
November 6, 2025 at 11:01 AM
📈COP delivers stock market boost for ‘green’ companies but renewables unaffected, Imperial College London study shows 🧵
Read it here: ow.ly/o6xY50XnEuH
Read it here: ow.ly/o6xY50XnEuH
Reposted by Alaa Al Khourdajie
The FRIDA overview paper: gmd.copernicus.org/articles/18/...
A coupled human-Earth IAM, with integrated climate impacts.
A coupled human-Earth IAM, with integrated climate impacts.
An overview of FRIDA v2.1: a feedback-based, fully coupled, global integrated assessment model of climate and humans
Abstract. The current crop of models assessed by the Intergovernmental Panel on Climate Change (IPCC) to produce their assessment reports lack endogenous process-based representations of climate-drive...
gmd.copernicus.org
October 30, 2025 at 8:26 AM
The FRIDA overview paper: gmd.copernicus.org/articles/18/...
A coupled human-Earth IAM, with integrated climate impacts.
A coupled human-Earth IAM, with integrated climate impacts.
Reposted by Alaa Al Khourdajie
Really important paper led by my @iiasa.ac.at colleague Alex Nauels www.nature.com/articles/s41...
“The difference between decisive climate action today and continued high emissions is not just measured in degrees of warming but also in meters of sea-level rise” 👏👏👏
“The difference between decisive climate action today and continued high emissions is not just measured in degrees of warming but also in meters of sea-level rise” 👏👏👏
Multi-century global and regional sea-level rise commitments from cumulative greenhouse gas emissions in the coming decades - Nature Climate Change
It is important to understand how much long-term sea-level rise is already committed due to historical and near-term emissions. Here the authors use a modelling framework to show how decisions on glob...
www.nature.com
October 24, 2025 at 10:40 AM
Really important paper led by my @iiasa.ac.at colleague Alex Nauels www.nature.com/articles/s41...
“The difference between decisive climate action today and continued high emissions is not just measured in degrees of warming but also in meters of sea-level rise” 👏👏👏
“The difference between decisive climate action today and continued high emissions is not just measured in degrees of warming but also in meters of sea-level rise” 👏👏👏
Reposted by Alaa Al Khourdajie
Every ton of CO2 matters :
@climatenerilie.bsky.social quantifies the climatic impacts of one large fossil fuel project and its implications for further human heat exposure or coral reef loss, and how committed emissions challenge climate pledges
www.nature.com/articles/s44...
@climatenerilie.bsky.social quantifies the climatic impacts of one large fossil fuel project and its implications for further human heat exposure or coral reef loss, and how committed emissions challenge climate pledges
www.nature.com/articles/s44...
October 16, 2025 at 2:26 PM
Every ton of CO2 matters :
@climatenerilie.bsky.social quantifies the climatic impacts of one large fossil fuel project and its implications for further human heat exposure or coral reef loss, and how committed emissions challenge climate pledges
www.nature.com/articles/s44...
@climatenerilie.bsky.social quantifies the climatic impacts of one large fossil fuel project and its implications for further human heat exposure or coral reef loss, and how committed emissions challenge climate pledges
www.nature.com/articles/s44...
Reposted by Alaa Al Khourdajie
We finally have a new paper out looking at how summary statistics from the AR6 scenario database are highly dependent on the sampling of the database.
High profile statistics are often more representative of the model fingerprint, not the physics.
www.nature.com/articles/s41...
1/
High profile statistics are often more representative of the model fingerprint, not the physics.
www.nature.com/articles/s41...
1/
October 2, 2025 at 10:02 AM
We finally have a new paper out looking at how summary statistics from the AR6 scenario database are highly dependent on the sampling of the database.
High profile statistics are often more representative of the model fingerprint, not the physics.
www.nature.com/articles/s41...
1/
High profile statistics are often more representative of the model fingerprint, not the physics.
www.nature.com/articles/s41...
1/
Reposted by Alaa Al Khourdajie
There are a few people that are inspirations to almost all scientists that I know, and Jane Goodall was one of them. RIP. 😢
Jane Goodall, the celebrated primatologist and conservationist, has died
Jane Goodall, the conservationist renowned for her groundbreaking chimpanzee field research and globe-spanning environmental advocacy, has died. She was 91.
apnews.com
October 1, 2025 at 8:53 PM
There are a few people that are inspirations to almost all scientists that I know, and Jane Goodall was one of them. RIP. 😢
Reposted by Alaa Al Khourdajie
How can the #IPCC navigate generative AI?
What does it mean for scientific assessment more broadly?
New working paper looks at scenarios for AI adoption & resistance, w/ @dralaaclimate.bsky.social @shinasayama.bsky.social and Oliver Geden
Reflections welcome!
www.swp-berlin.org/publications...
What does it mean for scientific assessment more broadly?
New working paper looks at scenarios for AI adoption & resistance, w/ @dralaaclimate.bsky.social @shinasayama.bsky.social and Oliver Geden
Reflections welcome!
www.swp-berlin.org/publications...
www.swp-berlin.org
October 1, 2025 at 3:45 PM
How can the #IPCC navigate generative AI?
What does it mean for scientific assessment more broadly?
New working paper looks at scenarios for AI adoption & resistance, w/ @dralaaclimate.bsky.social @shinasayama.bsky.social and Oliver Geden
Reflections welcome!
www.swp-berlin.org/publications...
What does it mean for scientific assessment more broadly?
New working paper looks at scenarios for AI adoption & resistance, w/ @dralaaclimate.bsky.social @shinasayama.bsky.social and Oliver Geden
Reflections welcome!
www.swp-berlin.org/publications...
New working paper out: "Four scenarios for an @ipcc.bsky.social navigating Artificial Intelligence"
Led by @hollyjeanbuck.bsky.social, with @shinasayama.bsky.social and Oliver Geden
Thread 🧵
1/13
Led by @hollyjeanbuck.bsky.social, with @shinasayama.bsky.social and Oliver Geden
Thread 🧵
1/13
September 29, 2025 at 11:36 AM
New working paper out: "Four scenarios for an @ipcc.bsky.social navigating Artificial Intelligence"
Led by @hollyjeanbuck.bsky.social, with @shinasayama.bsky.social and Oliver Geden
Thread 🧵
1/13
Led by @hollyjeanbuck.bsky.social, with @shinasayama.bsky.social and Oliver Geden
Thread 🧵
1/13