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.
New Year, new challenges
Happy to share that I'll be working on a new initiative this year to accelerate the emergence of radical ideas to solve big societal challenges and create a pipeline of investable and impactful scientific ventures.
We call it RIFF...
Happy to share that I'll be working on a new initiative this year to accelerate the emergence of radical ideas to solve big societal challenges and create a pipeline of investable and impactful scientific ventures.
We call it RIFF...
January 2, 2026 at 8:43 PM
New Year, new challenges
Happy to share that I'll be working on a new initiative this year to accelerate the emergence of radical ideas to solve big societal challenges and create a pipeline of investable and impactful scientific ventures.
We call it RIFF...
Happy to share that I'll be working on a new initiative this year to accelerate the emergence of radical ideas to solve big societal challenges and create a pipeline of investable and impactful scientific ventures.
We call it RIFF...
This is what the US department of Energy was posting on X (Twitter) before Christmas.
Coal is the worst fossil fuel.
There is no such thing as clean coal
Coal is the worst fossil fuel.
There is no such thing as clean coal
December 30, 2025 at 1:11 PM
This is what the US department of Energy was posting on X (Twitter) before Christmas.
Coal is the worst fossil fuel.
There is no such thing as clean coal
Coal is the worst fossil fuel.
There is no such thing as clean coal
Interesting graph comparing investments in clean and fossil energy since 2015.
techcrunch.com/2025/06/06/c...
techcrunch.com/2025/06/06/c...
December 29, 2025 at 10:35 AM
Interesting graph comparing investments in clean and fossil energy since 2015.
techcrunch.com/2025/06/06/c...
techcrunch.com/2025/06/06/c...
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...
Re-making coal!
Just wait a 100 million years
Just wait a 100 million years
October 27, 2025 at 7:04 PM
Re-making coal!
Just wait a 100 million years
Just wait a 100 million years
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
And here is the first article!!
Some learnings from my climate journey…
riffonsolutions.substack.com/p/what-have-...
Some learnings from my climate journey…
riffonsolutions.substack.com/p/what-have-...
What have I learned in 5 years working on climate? part 1
A quick look back with some (useful I hope) thoughts
riffonsolutions.substack.com
October 14, 2025 at 7:47 PM
And here is the first article!!
Some learnings from my climate journey…
riffonsolutions.substack.com/p/what-have-...
Some learnings from my climate journey…
riffonsolutions.substack.com/p/what-have-...
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…
More info here
www.linkedin.com/posts/greg-d...
www.linkedin.com/posts/greg-d...
Deep in the... | Greg De Temmerman
Deep in the... mine (literally...) 🏃♂️
A few months ago Rohitesh Dhawan asked me "We're going to run the World's deepest marathon, in a mine. Want to join?"
"Are you kidding...
www.linkedin.com
July 17, 2025 at 10:36 AM
More info here
www.linkedin.com/posts/greg-d...
www.linkedin.com/posts/greg-d...
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
I know. The irony is that we are visiting with a rental car which is… electric.
I am glad to know it can’t go on highways
I am glad to know it can’t go on highways
July 12, 2025 at 8:54 PM
I know. The irony is that we are visiting with a rental car which is… electric.
I am glad to know it can’t go on highways
I am glad to know it can’t go on highways
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
Pour le “voter ecolo” je mettrai in gros gros bemol
June 28, 2025 at 11:49 AM
Pour le “voter ecolo” je mettrai in gros gros bemol
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
