Greg De Temmerman
@gregdt.bsky.social
Physicist. Unlocking the critical climate solutions needed to avert and manage the worst climate impacts.
Deputy CEO and Chief Science Officer at Quadrature Climate Foundation
Lecturer. Author. TED Speaker.
Deputy CEO and Chief Science Officer at Quadrature Climate Foundation
Lecturer. Author. TED Speaker.
It's now official
With the 55 other intrepid runners that made the run we entered the @GWR Guinness World Records for the deepest marathon !!!
What an adventure it was.
With the 55 other intrepid runners that made the run we entered the @GWR Guinness World Records for the deepest marathon !!!
What an adventure it was.
November 20, 2025 at 12:25 PM
It's now official
With the 55 other intrepid runners that made the run we entered the @GWR Guinness World Records for the deepest marathon !!!
What an adventure it was.
With the 55 other intrepid runners that made the run we entered the @GWR Guinness World Records for the deepest marathon !!!
What an adventure it was.
The G-word and why we need to talk about it.
In my latest Substack, I lay out some thoughts on Solar Radiation Modification (aka geo-engineering) and why we need more public research on the topic.
Please subscribe (and react)
riffonsolutions.substack.com/p/we-need-to...
In my latest Substack, I lay out some thoughts on Solar Radiation Modification (aka geo-engineering) and why we need more public research on the topic.
Please subscribe (and react)
riffonsolutions.substack.com/p/we-need-to...
We need to talk about the G-word…
Geo-engineering is a contentious topic, yet one that we need to seriously research.
riffonsolutions.substack.com
November 18, 2025 at 8:55 AM
The G-word and why we need to talk about it.
In my latest Substack, I lay out some thoughts on Solar Radiation Modification (aka geo-engineering) and why we need more public research on the topic.
Please subscribe (and react)
riffonsolutions.substack.com/p/we-need-to...
In my latest Substack, I lay out some thoughts on Solar Radiation Modification (aka geo-engineering) and why we need more public research on the topic.
Please subscribe (and react)
riffonsolutions.substack.com/p/we-need-to...
A great graph to explain what the energy transition
- electricity is about 20% of final energy demand, we need to electrify most sectors (estimates now show that up to 70% is possible)
- electricity is still 60% fossile so we need to decarbonise it
ember-energy.org/latest-insig...
- electricity is about 20% of final energy demand, we need to electrify most sectors (estimates now show that up to 70% is possible)
- electricity is still 60% fossile so we need to decarbonise it
ember-energy.org/latest-insig...
November 16, 2025 at 5:12 PM
A great graph to explain what the energy transition
- electricity is about 20% of final energy demand, we need to electrify most sectors (estimates now show that up to 70% is possible)
- electricity is still 60% fossile so we need to decarbonise it
ember-energy.org/latest-insig...
- electricity is about 20% of final energy demand, we need to electrify most sectors (estimates now show that up to 70% is possible)
- electricity is still 60% fossile so we need to decarbonise it
ember-energy.org/latest-insig...
There are different ways to measure the global economy
- 112 trillion dollars
- 600 exajoules of primary energy, 400 in final energy
- 107 billion tons of natural resources
www.materialflows.net/visualisatio...
- 112 trillion dollars
- 600 exajoules of primary energy, 400 in final energy
- 107 billion tons of natural resources
www.materialflows.net/visualisatio...
November 2, 2025 at 6:16 PM
There are different ways to measure the global economy
- 112 trillion dollars
- 600 exajoules of primary energy, 400 in final energy
- 107 billion tons of natural resources
www.materialflows.net/visualisatio...
- 112 trillion dollars
- 600 exajoules of primary energy, 400 in final energy
- 107 billion tons of natural resources
www.materialflows.net/visualisatio...
When it comes to climate, doomism is a western luxury because we’re less affected.
The future is what we make of it… the longer we wait to act the more severe the consequences of climate change will be
The future is what we make of it… the longer we wait to act the more severe the consequences of climate change will be
October 27, 2025 at 5:43 PM
When it comes to climate, doomism is a western luxury because we’re less affected.
The future is what we make of it… the longer we wait to act the more severe the consequences of climate change will be
The future is what we make of it… the longer we wait to act the more severe the consequences of climate change will be
Not every day you break a word record. But for me this was yesterday!! We ran the world’s deepest marathon.
An impressive immersion in a working mine
An impressive immersion in a working mine
October 26, 2025 at 7:26 AM
Not every day you break a word record. But for me this was yesterday!! We ran the world’s deepest marathon.
An impressive immersion in a working mine
An impressive immersion in a working mine
Launching my Substack today !!
This will build on the content I am sharing regularly on LinkedIn and provide deeper thoughts on the fast changing space of climate and deep tech.
riffonsolutions.substack.com
This will build on the content I am sharing regularly on LinkedIn and provide deeper thoughts on the fast changing space of climate and deep tech.
riffonsolutions.substack.com
Riffing on solutions | Greg De Temmerman | Substack
A page to discuss solutions to big societal challenges with a focus on deep tech for energy and climate. My take as a pragmatic optimist on the role of science and innovation.
Warning: I love numbers....
riffonsolutions.substack.com
October 14, 2025 at 7:46 PM
Launching my Substack today !!
This will build on the content I am sharing regularly on LinkedIn and provide deeper thoughts on the fast changing space of climate and deep tech.
riffonsolutions.substack.com
This will build on the content I am sharing regularly on LinkedIn and provide deeper thoughts on the fast changing space of climate and deep tech.
riffonsolutions.substack.com
2 weeks to go before the World’s deepest marathon- 1.4 km below the surface.
This is going to be a world record if we make it and this is also for charity. Any donation is appreciated
worldsdeepestmarathon.raiselysite.com/greg-de-temmer…
This is going to be a world record if we make it and this is also for charity. Any donation is appreciated
worldsdeepestmarathon.raiselysite.com/greg-de-temmer…
October 11, 2025 at 12:04 PM
2 weeks to go before the World’s deepest marathon- 1.4 km below the surface.
This is going to be a world record if we make it and this is also for charity. Any donation is appreciated
worldsdeepestmarathon.raiselysite.com/greg-de-temmer…
This is going to be a world record if we make it and this is also for charity. Any donation is appreciated
worldsdeepestmarathon.raiselysite.com/greg-de-temmer…
100 days to go !!!! 🏃♂️
With a group of 60 people, we'll attempt a record-breaking marathon, 1,120m below sea level in Boliden's Garpenberg mine in Sweden.
This is done to raise money for 2 charities and change discussions around mining (critical for energy...)
Consider donating
With a group of 60 people, we'll attempt a record-breaking marathon, 1,120m below sea level in Boliden's Garpenberg mine in Sweden.
This is done to raise money for 2 charities and change discussions around mining (critical for energy...)
Consider donating
July 17, 2025 at 10:36 AM
100 days to go !!!! 🏃♂️
With a group of 60 people, we'll attempt a record-breaking marathon, 1,120m below sea level in Boliden's Garpenberg mine in Sweden.
This is done to raise money for 2 charities and change discussions around mining (critical for energy...)
Consider donating
With a group of 60 people, we'll attempt a record-breaking marathon, 1,120m below sea level in Boliden's Garpenberg mine in Sweden.
This is done to raise money for 2 charities and change discussions around mining (critical for energy...)
Consider donating
My family is against electric cars…
Have been listening to all the usual misinformation arguments for 90 minutes and people wonder why I am quiet…
Have been listening to all the usual misinformation arguments for 90 minutes and people wonder why I am quiet…
July 12, 2025 at 8:22 PM
My family is against electric cars…
Have been listening to all the usual misinformation arguments for 90 minutes and people wonder why I am quiet…
Have been listening to all the usual misinformation arguments for 90 minutes and people wonder why I am quiet…
June 28, 2025 at 3:55 PM
A bit of a plug, but quite proud of that interview in @newscientist.com about the work we do at the Foundation.
You'll also find how I deal with optimism/pessimism ;-)
Thanks @tinymaddie.bsky.social for the great work
www.newscientist.com/article/2482...
You'll also find how I deal with optimism/pessimism ;-)
Thanks @tinymaddie.bsky.social for the great work
www.newscientist.com/article/2482...
The man quietly spending $1 billion on climate action
From geoengineering to anti-methane cow vaccines and green aviation fuel, meet the former nuclear physicist helping to decide which climate change technologies hold the most promise
www.newscientist.com
June 12, 2025 at 10:50 AM
A bit of a plug, but quite proud of that interview in @newscientist.com about the work we do at the Foundation.
You'll also find how I deal with optimism/pessimism ;-)
Thanks @tinymaddie.bsky.social for the great work
www.newscientist.com/article/2482...
You'll also find how I deal with optimism/pessimism ;-)
Thanks @tinymaddie.bsky.social for the great work
www.newscientist.com/article/2482...
Reposted by Greg De Temmerman
People often wonder how climate activists stay positive. I feel like I can get behind this method from @gregdt.bsky.social
June 11, 2025 at 4:31 PM
People often wonder how climate activists stay positive. I feel like I can get behind this method from @gregdt.bsky.social
In 2023, the world produced 4.5 billion tons of oil, 9 billion tons of coal, and 2.5 billion tons of fossil gas (lnkd.in/eUUxhqc5). The combustion of which released about 37 billion tons of CO2 into the atmosphere (lnkd.in/e5t6bdhR)
www.circularity-gap.world
www.circularity-gap.world
June 8, 2025 at 1:39 PM
In 2023, the world produced 4.5 billion tons of oil, 9 billion tons of coal, and 2.5 billion tons of fossil gas (lnkd.in/eUUxhqc5). The combustion of which released about 37 billion tons of CO2 into the atmosphere (lnkd.in/e5t6bdhR)
www.circularity-gap.world
www.circularity-gap.world
Red cap
Proud to have contributed to the launch panel of the Make Science Great Again panel by @wedonthavetime.bsky.social
Knowledge is power. Defending science is critical for well functioning societies
Proud to have contributed to the launch panel of the Make Science Great Again panel by @wedonthavetime.bsky.social
Knowledge is power. Defending science is critical for well functioning societies
April 28, 2025 at 7:20 PM
Red cap
Proud to have contributed to the launch panel of the Make Science Great Again panel by @wedonthavetime.bsky.social
Knowledge is power. Defending science is critical for well functioning societies
Proud to have contributed to the launch panel of the Make Science Great Again panel by @wedonthavetime.bsky.social
Knowledge is power. Defending science is critical for well functioning societies
Great Sankey diagram about the global material flows of plastics in 2022. About 400 million tons produced.
98% of the feedstock were fossil- coal accounts for 44% and oil for 40%
www.nature.com/articles/s43...
98% of the feedstock were fossil- coal accounts for 44% and oil for 40%
www.nature.com/articles/s43...
April 22, 2025 at 4:34 PM
Great Sankey diagram about the global material flows of plastics in 2022. About 400 million tons produced.
98% of the feedstock were fossil- coal accounts for 44% and oil for 40%
www.nature.com/articles/s43...
98% of the feedstock were fossil- coal accounts for 44% and oil for 40%
www.nature.com/articles/s43...
L’energie c’est simple et complexe
J’ai eu le plaisir de discuter énergie avec Vinz Kanté sur sa chaîne Limit. On part des bases pour discuter de nombreux aspects de la decarbonation.
Bonne écoute
www.youtube.com/watch?v=Ts_g...
J’ai eu le plaisir de discuter énergie avec Vinz Kanté sur sa chaîne Limit. On part des bases pour discuter de nombreux aspects de la decarbonation.
Bonne écoute
www.youtube.com/watch?v=Ts_g...
MYTHES & REALITÉS SUR L'ÉNERGIE ? - Greg De Temmerman | LIMIT
YouTube video by LIMIT
www.youtube.com
April 13, 2025 at 5:43 PM
L’energie c’est simple et complexe
J’ai eu le plaisir de discuter énergie avec Vinz Kanté sur sa chaîne Limit. On part des bases pour discuter de nombreux aspects de la decarbonation.
Bonne écoute
www.youtube.com/watch?v=Ts_g...
J’ai eu le plaisir de discuter énergie avec Vinz Kanté sur sa chaîne Limit. On part des bases pour discuter de nombreux aspects de la decarbonation.
Bonne écoute
www.youtube.com/watch?v=Ts_g...
Reposted by Greg De Temmerman
Il est sorti!!!!
Une vision complete de la decarbonation des transports passant par l'énergie, l'aménagement des territoires, les politiques publiques et l'économie.
Fier d'avoir pu contribuer a ce travail !
www.fnac.com/a21105661/Je...
Une vision complete de la decarbonation des transports passant par l'énergie, l'aménagement des territoires, les politiques publiques et l'économie.
Fier d'avoir pu contribuer a ce travail !
www.fnac.com/a21105661/Je...
April 11, 2025 at 8:09 AM
Il est sorti!!!!
Une vision complete de la decarbonation des transports passant par l'énergie, l'aménagement des territoires, les politiques publiques et l'économie.
Fier d'avoir pu contribuer a ce travail !
www.fnac.com/a21105661/Je...
Une vision complete de la decarbonation des transports passant par l'énergie, l'aménagement des territoires, les politiques publiques et l'économie.
Fier d'avoir pu contribuer a ce travail !
www.fnac.com/a21105661/Je...
Last year the share of low carbon electricity in the global mix reached 40% thanks for data deployment of renewables.
But fossil production also increased albeit slower.
Source ember-energy.org/latest-insig...
But fossil production also increased albeit slower.
Source ember-energy.org/latest-insig...
April 9, 2025 at 6:21 AM
Last year the share of low carbon electricity in the global mix reached 40% thanks for data deployment of renewables.
But fossil production also increased albeit slower.
Source ember-energy.org/latest-insig...
But fossil production also increased albeit slower.
Source ember-energy.org/latest-insig...
Energy security will become the highest priority for the transformation of the energy system- climate will come second at best.
This graph shows how the US, EU, China fare on that metric. The US went from a major oil importer to a next exporter (it still imports a lot).
This graph shows how the US, EU, China fare on that metric. The US went from a major oil importer to a next exporter (it still imports a lot).
April 7, 2025 at 7:10 AM
Energy security will become the highest priority for the transformation of the energy system- climate will come second at best.
This graph shows how the US, EU, China fare on that metric. The US went from a major oil importer to a next exporter (it still imports a lot).
This graph shows how the US, EU, China fare on that metric. The US went from a major oil importer to a next exporter (it still imports a lot).
Geothermal is having a moment. Glad to support with QCF a study on the Future of Geothermal in the UK led by Project Innerspace.
Listen to that episode of Cleaning Up to know more about what’s new in that field m.youtube.com/watch?v=n3I2...
Listen to that episode of Cleaning Up to know more about what’s new in that field m.youtube.com/watch?v=n3I2...
April 6, 2025 at 11:30 AM
Geothermal is having a moment. Glad to support with QCF a study on the Future of Geothermal in the UK led by Project Innerspace.
Listen to that episode of Cleaning Up to know more about what’s new in that field m.youtube.com/watch?v=n3I2...
Listen to that episode of Cleaning Up to know more about what’s new in that field m.youtube.com/watch?v=n3I2...
Given that the energy transition seems to be entering a bumpy phase I have decided to get back to the basics and invest in a coal steam engine
😅
😅
April 5, 2025 at 3:53 PM
Given that the energy transition seems to be entering a bumpy phase I have decided to get back to the basics and invest in a coal steam engine
😅
😅
What is happening to the US science system is dramatic. De-funding science, taking references to climate change off federal websites etc, won’t change the reality of facts.
And cutting your main innovation engine is just sabotage…
www.scientificamerican.com/article/top-...
And cutting your main innovation engine is just sabotage…
www.scientificamerican.com/article/top-...
Top U.S. Scientists Are Calling Out Trump’s ‘Climate of Fear’
Despite fears that speaking out will make them targets, top researchers warn that the Trump administration’s “wholesale assault on U.S. science” will harm the nation
www.scientificamerican.com
April 1, 2025 at 8:37 PM
What is happening to the US science system is dramatic. De-funding science, taking references to climate change off federal websites etc, won’t change the reality of facts.
And cutting your main innovation engine is just sabotage…
www.scientificamerican.com/article/top-...
And cutting your main innovation engine is just sabotage…
www.scientificamerican.com/article/top-...
Fossil fuels represent 40% of the mass of global trade by sea (lnkd.in/ePs-G-pN). Some numbers for shipped fuels:
- 1.3 billion tons of coal (lnkd.in/exipiBEx.)
- 2 billion tons of oil (lnkd.in/eyW3EAXN)
- around 550 million tons of LNG (lnkd.in/eKPmmmzR.)
iea.blob.core.windows.net/assets/34511...
- 1.3 billion tons of coal (lnkd.in/exipiBEx.)
- 2 billion tons of oil (lnkd.in/eyW3EAXN)
- around 550 million tons of LNG (lnkd.in/eKPmmmzR.)
iea.blob.core.windows.net/assets/34511...
April 1, 2025 at 7:36 AM
Fossil fuels represent 40% of the mass of global trade by sea (lnkd.in/ePs-G-pN). Some numbers for shipped fuels:
- 1.3 billion tons of coal (lnkd.in/exipiBEx.)
- 2 billion tons of oil (lnkd.in/eyW3EAXN)
- around 550 million tons of LNG (lnkd.in/eKPmmmzR.)
iea.blob.core.windows.net/assets/34511...
- 1.3 billion tons of coal (lnkd.in/exipiBEx.)
- 2 billion tons of oil (lnkd.in/eyW3EAXN)
- around 550 million tons of LNG (lnkd.in/eKPmmmzR.)
iea.blob.core.windows.net/assets/34511...