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.
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...
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
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
June 28, 2025 at 3:55 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
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...
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
😅
😅
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...
Time to impact
Technologies can deploy fast. Recent examples are mobile phones, internet, vaccines, shale oil/gas, etc.
But it can take decades between concept and commercialisation- as illustrated in the graph below for different energy-related technologies
Source: www.iea.org/reports/net-...
Technologies can deploy fast. Recent examples are mobile phones, internet, vaccines, shale oil/gas, etc.
But it can take decades between concept and commercialisation- as illustrated in the graph below for different energy-related technologies
Source: www.iea.org/reports/net-...
March 31, 2025 at 12:01 PM
Time to impact
Technologies can deploy fast. Recent examples are mobile phones, internet, vaccines, shale oil/gas, etc.
But it can take decades between concept and commercialisation- as illustrated in the graph below for different energy-related technologies
Source: www.iea.org/reports/net-...
Technologies can deploy fast. Recent examples are mobile phones, internet, vaccines, shale oil/gas, etc.
But it can take decades between concept and commercialisation- as illustrated in the graph below for different energy-related technologies
Source: www.iea.org/reports/net-...
Always a special moment when one receives the first hard copies!!!
Release in France on April 11 !!
Release in France on April 11 !!
March 30, 2025 at 4:10 PM
Always a special moment when one receives the first hard copies!!!
Release in France on April 11 !!
Release in France on April 11 !!
The EU has an electricity price problem- in large part because expensive gas sets the price of electricity most of the time.
Customers currently do not get the benefits of installing low cost renewables…
Customers currently do not get the benefits of installing low cost renewables…
March 30, 2025 at 9:57 AM
The EU has an electricity price problem- in large part because expensive gas sets the price of electricity most of the time.
Customers currently do not get the benefits of installing low cost renewables…
Customers currently do not get the benefits of installing low cost renewables…
Many countries are starting to see their oil demand be affected by the deployment of EVs. Below is the example of Norway where 96% of new cars sold are electric/hybrid. China oil demand seems to plateau too.
This is how transitions start...
www.bloomberg.com/news/newslet...
This is how transitions start...
www.bloomberg.com/news/newslet...
March 29, 2025 at 2:23 PM
Many countries are starting to see their oil demand be affected by the deployment of EVs. Below is the example of Norway where 96% of new cars sold are electric/hybrid. China oil demand seems to plateau too.
This is how transitions start...
www.bloomberg.com/news/newslet...
This is how transitions start...
www.bloomberg.com/news/newslet...
When will sodium ion batteries become economically competitive with Li batteries?
A recent study looks at it in details by considering learning rates for both technologies- they see the 2030s as when it can happen depending on ambition and variations in the Li market.
A recent study looks at it in details by considering learning rates for both technologies- they see the 2030s as when it can happen depending on ambition and variations in the Li market.
March 26, 2025 at 11:13 AM
When will sodium ion batteries become economically competitive with Li batteries?
A recent study looks at it in details by considering learning rates for both technologies- they see the 2030s as when it can happen depending on ambition and variations in the Li market.
A recent study looks at it in details by considering learning rates for both technologies- they see the 2030s as when it can happen depending on ambition and variations in the Li market.
Great article in the NY times about the deployment of renewables and how it is visible from space.
The installed capacity of wind and PV is now over 1000 and 1400 GW, respectively
www.nytimes.com/interactive/...
The installed capacity of wind and PV is now over 1000 and 1400 GW, respectively
www.nytimes.com/interactive/...
March 22, 2025 at 4:01 PM
Great article in the NY times about the deployment of renewables and how it is visible from space.
The installed capacity of wind and PV is now over 1000 and 1400 GW, respectively
www.nytimes.com/interactive/...
The installed capacity of wind and PV is now over 1000 and 1400 GW, respectively
www.nytimes.com/interactive/...
50
It is the number of metals one can find in a standard Seat Leon. In terms of mass, iron (for steel) accounts for about 80%, then follows aluminium (10%). One can find a few grams of gold and milligrams of things like indium
All data here: www.sciencedirect.com/science/arti...
It is the number of metals one can find in a standard Seat Leon. In terms of mass, iron (for steel) accounts for about 80%, then follows aluminium (10%). One can find a few grams of gold and milligrams of things like indium
All data here: www.sciencedirect.com/science/arti...
March 2, 2025 at 9:38 AM
50
It is the number of metals one can find in a standard Seat Leon. In terms of mass, iron (for steel) accounts for about 80%, then follows aluminium (10%). One can find a few grams of gold and milligrams of things like indium
All data here: www.sciencedirect.com/science/arti...
It is the number of metals one can find in a standard Seat Leon. In terms of mass, iron (for steel) accounts for about 80%, then follows aluminium (10%). One can find a few grams of gold and milligrams of things like indium
All data here: www.sciencedirect.com/science/arti...
Countries in Africa have very different energy situations. Shown here is the Levelised Cost of Electricity, rate of electrification, the state of gas reserves (indicated if the country has over 5 tn cubic ft of reserves) and the share of electricity from fossil fuels.
www.nature.com/articles/s41...
www.nature.com/articles/s41...
February 15, 2025 at 6:43 PM
Countries in Africa have very different energy situations. Shown here is the Levelised Cost of Electricity, rate of electrification, the state of gas reserves (indicated if the country has over 5 tn cubic ft of reserves) and the share of electricity from fossil fuels.
www.nature.com/articles/s41...
www.nature.com/articles/s41...
The use of coal is falling fast in the EU- it now accounts for less than 10% of electricity production.
Interestingly, 2 countries (Germany and Poland) account for 75% of coal use for electricity production…
Interestingly, 2 countries (Germany and Poland) account for 75% of coal use for electricity production…
February 8, 2025 at 12:43 PM
The use of coal is falling fast in the EU- it now accounts for less than 10% of electricity production.
Interestingly, 2 countries (Germany and Poland) account for 75% of coal use for electricity production…
Interestingly, 2 countries (Germany and Poland) account for 75% of coal use for electricity production…
While there has been progress in the last 10 years- we’re still on a path where current policies lead a level of warming of 2.5-2.9 degrees by the end of the century.
And it is hard to imagine what a 2.9 degrees warmer world is…
And it is hard to imagine what a 2.9 degrees warmer world is…
January 25, 2025 at 6:35 PM
While there has been progress in the last 10 years- we’re still on a path where current policies lead a level of warming of 2.5-2.9 degrees by the end of the century.
And it is hard to imagine what a 2.9 degrees warmer world is…
And it is hard to imagine what a 2.9 degrees warmer world is…