Leon Simons
@leonsimons.com
Mission: To understand & protect the home planet.
Innovator, climate research & communication, social entrepreneur.
Board member Club of Rome NL
Innovator, climate research & communication, social entrepreneur.
Board member Club of Rome NL
Pinned
Leon Simons
@leonsimons.com
· Feb 19
🚨The most important graph in the world has another year of data, and it doesn't look good!🚨
NASA CERES satellites measure how much sunlight Earth absorbs and how much heat is radiated back to space.
The difference is heat accumulation, which has more than tripled!
NASA CERES satellites measure how much sunlight Earth absorbs and how much heat is radiated back to space.
The difference is heat accumulation, which has more than tripled!
Is Solar Geoengineering Too Risky?
With Chris Parker
Join us later today on Climate Chat.
Link below.
See the time for your region in the link below and subscribe and hit the bell button to get a notification when we go live.
www.youtube.com/live/-GyXpRs...
With Chris Parker
Join us later today on Climate Chat.
Link below.
See the time for your region in the link below and subscribe and hit the bell button to get a notification when we go live.
www.youtube.com/live/-GyXpRs...
Is Solar-Geoengineering Too Risky? with Chris Parker
In this Climate Chat episode, we interview interview climate scient...
www.youtube.com
September 20, 2026 at 8:16 AM
Is Solar Geoengineering Too Risky?
With Chris Parker
Join us later today on Climate Chat.
Link below.
See the time for your region in the link below and subscribe and hit the bell button to get a notification when we go live.
www.youtube.com/live/-GyXpRs...
With Chris Parker
Join us later today on Climate Chat.
Link below.
See the time for your region in the link below and subscribe and hit the bell button to get a notification when we go live.
www.youtube.com/live/-GyXpRs...
"Shall we play a game?"
September 18, 2026 at 8:33 PM
"Shall we play a game?"
We could already face 2.5-3°C of global warming by 2050!
September 18, 2026 at 8:27 PM
We could already face 2.5-3°C of global warming by 2050!
Reposted by Leon Simons
Sunday 9/20 at 10am PT on Climate Chat: Is Solar-Geoengineering Too Risky? with climate scientist Chris Parker @chrisjparker.bsky.social.
#Geoengineering #SRM #ClimateRisks
@leonsimons.com @bikingmzstacey.bsky.social @radsci.bsky.social
youtube.com/live/-GyXpRs...
#Geoengineering #SRM #ClimateRisks
@leonsimons.com @bikingmzstacey.bsky.social @radsci.bsky.social
youtube.com/live/-GyXpRs...
Is Solar-Geoengineering Too Risky? with Chris Parker
YouTube video by Climate Chat
youtube.com
September 18, 2026 at 6:29 PM
Sunday 9/20 at 10am PT on Climate Chat: Is Solar-Geoengineering Too Risky? with climate scientist Chris Parker @chrisjparker.bsky.social.
#Geoengineering #SRM #ClimateRisks
@leonsimons.com @bikingmzstacey.bsky.social @radsci.bsky.social
youtube.com/live/-GyXpRs...
#Geoengineering #SRM #ClimateRisks
@leonsimons.com @bikingmzstacey.bsky.social @radsci.bsky.social
youtube.com/live/-GyXpRs...
September 16, 2026 at 8:06 PM
Reposted by Leon Simons
Scorching conditions this year have triggered wildfires in European countries that are normally considered to be damp and cool
Rapid climate change brings wildfire threat to new corners of Europe | New Scientist
Scorching conditions this year have triggered wildfires in European countries that are normally considered to be damp and cool
www.newscientist.com
September 15, 2026 at 7:50 AM
Scorching conditions this year have triggered wildfires in European countries that are normally considered to be damp and cool
Climate Chat is starting soon!
The Enigma of Climate Inaction with Frédéric Samama
"Why Are We Doing Nothing (or Almost Nothing) in the Face of Catastrophe?"
www.youtube.com/live/dHPkHff...
The Enigma of Climate Inaction with Frédéric Samama
"Why Are We Doing Nothing (or Almost Nothing) in the Face of Catastrophe?"
www.youtube.com/live/dHPkHff...
The Enigma of Climate Inaction with Frédéric Samama
YouTube video by Climate Chat
www.youtube.com
September 13, 2026 at 4:27 PM
Climate Chat is starting soon!
The Enigma of Climate Inaction with Frédéric Samama
"Why Are We Doing Nothing (or Almost Nothing) in the Face of Catastrophe?"
www.youtube.com/live/dHPkHff...
The Enigma of Climate Inaction with Frédéric Samama
"Why Are We Doing Nothing (or Almost Nothing) in the Face of Catastrophe?"
www.youtube.com/live/dHPkHff...
Reposted by Leon Simons
Een hoop strijdlust en energie op de #klimaatmars Altijd goed om te zien, de enige juiste houding
Toch loop ik met een knoop in mijn buik. Deze boodschap van @leonsimons.com resoneert niet bepaald in de samenleving
Dat zou wel moeten. De opwarming versnelt
1/
reportersonline.nl/over-25-jaar...
Toch loop ik met een knoop in mijn buik. Deze boodschap van @leonsimons.com resoneert niet bepaald in de samenleving
Dat zou wel moeten. De opwarming versnelt
1/
reportersonline.nl/over-25-jaar...
Over 25 jaar kan de wereld al tot 3 graden zijn opgewarmd - Reporters Online
Acht deskundigen en wetenschappers trokken deze week aan de noodrem. De aanleiding: in aanloop naar de verkiezingen praten politici en media nauwelijks over het klimaat. En dat terwijl de opwarming vo...
reportersonline.nl
September 12, 2026 at 11:02 PM
Een hoop strijdlust en energie op de #klimaatmars Altijd goed om te zien, de enige juiste houding
Toch loop ik met een knoop in mijn buik. Deze boodschap van @leonsimons.com resoneert niet bepaald in de samenleving
Dat zou wel moeten. De opwarming versnelt
1/
reportersonline.nl/over-25-jaar...
Toch loop ik met een knoop in mijn buik. Deze boodschap van @leonsimons.com resoneert niet bepaald in de samenleving
Dat zou wel moeten. De opwarming versnelt
1/
reportersonline.nl/over-25-jaar...
Reposted by Leon Simons
Sunday 9/13 at 10am PT on Climate Chat: The Enigma of Climate Inaction with author Frédéric Samama. Why do we fail to act?
youtube.com/live/dHPkHff...
@leonsimons.com @bikingmzstacey.bsky.social @radsci.bsky.social
#ClimateCrisis #ClimateInaction
youtube.com/live/dHPkHff...
@leonsimons.com @bikingmzstacey.bsky.social @radsci.bsky.social
#ClimateCrisis #ClimateInaction
The Enigma of Climate Inaction with Frédéric Samama
YouTube video by Climate Chat
youtube.com
September 12, 2026 at 10:53 PM
Sunday 9/13 at 10am PT on Climate Chat: The Enigma of Climate Inaction with author Frédéric Samama. Why do we fail to act?
youtube.com/live/dHPkHff...
@leonsimons.com @bikingmzstacey.bsky.social @radsci.bsky.social
#ClimateCrisis #ClimateInaction
youtube.com/live/dHPkHff...
@leonsimons.com @bikingmzstacey.bsky.social @radsci.bsky.social
#ClimateCrisis #ClimateInaction
The Gargantuan Climate Lie, Climate Chat with Adam McKay
@ghostpanther.bsky.social
@yellowdotstudios.bsky.social
@ghostpanther.bsky.social
@yellowdotstudios.bsky.social
September 12, 2026 at 12:52 PM
The Gargantuan Climate Lie, Climate Chat with Adam McKay
@ghostpanther.bsky.social
@yellowdotstudios.bsky.social
@ghostpanther.bsky.social
@yellowdotstudios.bsky.social
Reposted by Leon Simons
Goed, hup, van start!
Hard gewerkt ✍️, deze week, dus de 🪫 is wat leeg. Maar ach, de blik op de nabije toekomst is een stuk vermoeiender. In de trein naar Adam met @bienm.bsky.social, @fleur123.bsky.social, @erwinmulders.bsky.social
En ook een beetje met @leonsimons.com natuurlijk 😏
Hard gewerkt ✍️, deze week, dus de 🪫 is wat leeg. Maar ach, de blik op de nabije toekomst is een stuk vermoeiender. In de trein naar Adam met @bienm.bsky.social, @fleur123.bsky.social, @erwinmulders.bsky.social
En ook een beetje met @leonsimons.com natuurlijk 😏
September 12, 2026 at 10:59 AM
Goed, hup, van start!
Hard gewerkt ✍️, deze week, dus de 🪫 is wat leeg. Maar ach, de blik op de nabije toekomst is een stuk vermoeiender. In de trein naar Adam met @bienm.bsky.social, @fleur123.bsky.social, @erwinmulders.bsky.social
En ook een beetje met @leonsimons.com natuurlijk 😏
Hard gewerkt ✍️, deze week, dus de 🪫 is wat leeg. Maar ach, de blik op de nabije toekomst is een stuk vermoeiender. In de trein naar Adam met @bienm.bsky.social, @fleur123.bsky.social, @erwinmulders.bsky.social
En ook een beetje met @leonsimons.com natuurlijk 😏
Reposted by Leon Simons
"I'd much rather talk to a climate denier, a real person who's been told climate warming is BS, than a privileged, white centrist. I've never encountered such an incurious, more blasé lot than that group."
The Climate Chat pod with @ghostpanther.bsky.social is up, and it's a barn burner.
The Climate Chat pod with @ghostpanther.bsky.social is up, and it's a barn burner.
We had one of the greatest Climate Chat conversations to date, with Adam McKay about 'The Gargantuan Climate Lie'.
It will air this Sunday. Subscribe and hit the bell button to get a notification when it goes live.
@ghostpanther.bsky.social
@danmiller999.bsky.social
youtu.be/PFU7LqchidY
It will air this Sunday. Subscribe and hit the bell button to get a notification when it goes live.
@ghostpanther.bsky.social
@danmiller999.bsky.social
youtu.be/PFU7LqchidY
The Gargantuan Climate Lie with Adam McKay
YouTube video by Climate Chat
youtu.be
September 11, 2026 at 5:23 PM
"I'd much rather talk to a climate denier, a real person who's been told climate warming is BS, than a privileged, white centrist. I've never encountered such an incurious, more blasé lot than that group."
The Climate Chat pod with @ghostpanther.bsky.social is up, and it's a barn burner.
The Climate Chat pod with @ghostpanther.bsky.social is up, and it's a barn burner.
Reposted by Leon Simons
hey so Yottajoules are wild, man. the only time I've ever had to do a calculation that resulted in an answer in Yottajoules was while doing relativistic kinematics equations for the sci-fi epic I wrote. I had to kill capital ships about 15x the size of the Death Star, and
Greenhouse gases we add to the atmosphere and the resulting Earth's Energy Imbalance could cause about a yottajoule (1,000,000,000,000,000,000,000,000 joules) of heat to accumulate in the Earth system this century.
Causing an energy level similar to the Eemian, when sea level was ~7.5m higher!
1/
Causing an energy level similar to the Eemian, when sea level was ~7.5m higher!
1/
September 11, 2026 at 2:18 AM
hey so Yottajoules are wild, man. the only time I've ever had to do a calculation that resulted in an answer in Yottajoules was while doing relativistic kinematics equations for the sci-fi epic I wrote. I had to kill capital ships about 15x the size of the Death Star, and
🌊🌡📈
Global Sea Surface Temperatures are being shattered yet again.
This is probably unprecedented for 100s of thousands of years, based on paleoclimatology.
Global Sea Surface Temperatures are being shattered yet again.
This is probably unprecedented for 100s of thousands of years, based on paleoclimatology.
September 10, 2026 at 11:12 AM
🌊🌡📈
Global Sea Surface Temperatures are being shattered yet again.
This is probably unprecedented for 100s of thousands of years, based on paleoclimatology.
Global Sea Surface Temperatures are being shattered yet again.
This is probably unprecedented for 100s of thousands of years, based on paleoclimatology.
🚨🌊🌡📈
During the Southern Hemisphere (which holds most of the world's ocean) winter, global Sea Surface Temperatures have reached another record high!
During the Southern Hemisphere (which holds most of the world's ocean) winter, global Sea Surface Temperatures have reached another record high!
September 8, 2026 at 3:48 PM
🚨🌊🌡📈
During the Southern Hemisphere (which holds most of the world's ocean) winter, global Sea Surface Temperatures have reached another record high!
During the Southern Hemisphere (which holds most of the world's ocean) winter, global Sea Surface Temperatures have reached another record high!
"In the national defense arena, Vice President Cheney famously said that, if there is a one percent chance that Pakistani scientists are helping al-Qaeda build a nuclear weapon, “we have to treat it as a certainty in terms of our response.”"
I estimate the chance of reaching 3°C by ~2050 to be >5%
I estimate the chance of reaching 3°C by ~2050 to be >5%
September 8, 2026 at 3:36 PM
"In the national defense arena, Vice President Cheney famously said that, if there is a one percent chance that Pakistani scientists are helping al-Qaeda build a nuclear weapon, “we have to treat it as a certainty in terms of our response.”"
I estimate the chance of reaching 3°C by ~2050 to be >5%
I estimate the chance of reaching 3°C by ~2050 to be >5%
Climate Chat with Adam McKay is now airing!
@ghostpanther.bsky.social
@ghostpanther.bsky.social
youtu.be/PFU7LqchidY
@ghostpanther.bsky.social
@ghostpanther.bsky.social
youtu.be/PFU7LqchidY
The Gargantuan Climate Lie with Adam McKay
YouTube video by Climate Chat
youtu.be
September 6, 2026 at 5:03 PM
Climate Chat with Adam McKay is now airing!
@ghostpanther.bsky.social
@ghostpanther.bsky.social
youtu.be/PFU7LqchidY
@ghostpanther.bsky.social
@ghostpanther.bsky.social
youtu.be/PFU7LqchidY
If this data was about the cash flow of a major economy, it would be covered by media everywhere.
But as it 'only' shows global heat flow, it won't be covered anywhere..
But as it 'only' shows global heat flow, it won't be covered anywhere..
September 6, 2026 at 10:16 AM
If this data was about the cash flow of a major economy, it would be covered by media everywhere.
But as it 'only' shows global heat flow, it won't be covered anywhere..
But as it 'only' shows global heat flow, it won't be covered anywhere..
We had one of the greatest Climate Chat conversations to date, with Adam McKay about 'The Gargantuan Climate Lie'.
It will air this Sunday. Subscribe and hit the bell button to get a notification when it goes live.
@ghostpanther.bsky.social
@danmiller999.bsky.social
youtu.be/PFU7LqchidY
It will air this Sunday. Subscribe and hit the bell button to get a notification when it goes live.
@ghostpanther.bsky.social
@danmiller999.bsky.social
youtu.be/PFU7LqchidY
The Gargantuan Climate Lie with Adam McKay
YouTube video by Climate Chat
youtu.be
September 5, 2026 at 10:17 PM
We had one of the greatest Climate Chat conversations to date, with Adam McKay about 'The Gargantuan Climate Lie'.
It will air this Sunday. Subscribe and hit the bell button to get a notification when it goes live.
@ghostpanther.bsky.social
@danmiller999.bsky.social
youtu.be/PFU7LqchidY
It will air this Sunday. Subscribe and hit the bell button to get a notification when it goes live.
@ghostpanther.bsky.social
@danmiller999.bsky.social
youtu.be/PFU7LqchidY
🚨The most important NASA graph in the world has another 6 months of data, and it looks even worse. 🚨
NASA CERES satellites measure how much sunlight Earth absorbs and how much heat is radiated back to space.
The difference is heat accumulation, which has more than tripled over the past 26 years!
NASA CERES satellites measure how much sunlight Earth absorbs and how much heat is radiated back to space.
The difference is heat accumulation, which has more than tripled over the past 26 years!
September 4, 2026 at 2:09 PM
🚨The most important NASA graph in the world has another 6 months of data, and it looks even worse. 🚨
NASA CERES satellites measure how much sunlight Earth absorbs and how much heat is radiated back to space.
The difference is heat accumulation, which has more than tripled over the past 26 years!
NASA CERES satellites measure how much sunlight Earth absorbs and how much heat is radiated back to space.
The difference is heat accumulation, which has more than tripled over the past 26 years!
Reposted by Leon Simons
Are calling me an elephant? 😅
I expect discussions might have been somewhat similar to those described in the minutes of the IPCC AR6 SR SPM talks.
When aerosols were left out, because "INDIA called for deleting it"
And adding the invaluable figure WG1 SPM.2 was "opposed by SAUDI ARABIA and INDIA"
I expect discussions might have been somewhat similar to those described in the minutes of the IPCC AR6 SR SPM talks.
When aerosols were left out, because "INDIA called for deleting it"
And adding the invaluable figure WG1 SPM.2 was "opposed by SAUDI ARABIA and INDIA"
September 3, 2026 at 12:38 PM
Are calling me an elephant? 😅
I expect discussions might have been somewhat similar to those described in the minutes of the IPCC AR6 SR SPM talks.
When aerosols were left out, because "INDIA called for deleting it"
And adding the invaluable figure WG1 SPM.2 was "opposed by SAUDI ARABIA and INDIA"
I expect discussions might have been somewhat similar to those described in the minutes of the IPCC AR6 SR SPM talks.
When aerosols were left out, because "INDIA called for deleting it"
And adding the invaluable figure WG1 SPM.2 was "opposed by SAUDI ARABIA and INDIA"
Reposted by Leon Simons
I'm more active on YouTube with Climate Chat nowadays (you're very welcome to come on!). YT also has it's flaws and shorts are pushed over long videos.
We talked about the changing media landscape in this great conversation with @ghostpanther.bsky.social, which will air Sunday
youtu.be/PFU7LqchidY
We talked about the changing media landscape in this great conversation with @ghostpanther.bsky.social, which will air Sunday
youtu.be/PFU7LqchidY
The Gargantuan Climate Lie with Adam McKay
YouTube video by Climate Chat
youtu.be
September 3, 2026 at 10:57 AM
I'm more active on YouTube with Climate Chat nowadays (you're very welcome to come on!). YT also has it's flaws and shorts are pushed over long videos.
We talked about the changing media landscape in this great conversation with @ghostpanther.bsky.social, which will air Sunday
youtu.be/PFU7LqchidY
We talked about the changing media landscape in this great conversation with @ghostpanther.bsky.social, which will air Sunday
youtu.be/PFU7LqchidY
Someone advised me to put this on a t shirt.
Anyone who'd buy this?
Anyone who'd buy this?
September 3, 2026 at 9:03 AM
Someone advised me to put this on a t shirt.
Anyone who'd buy this?
Anyone who'd buy this?
Reposted by Leon Simons
"Overshoot" is where you first exceed a threshold (say 1.5C) and return later.
Yes, yes, there are / were no overshoot pathways.
These are the "no overshoot" scenarios from AR6. One can question whether they were ever feasible, but they now involve time travel.
3/
Yes, yes, there are / were no overshoot pathways.
These are the "no overshoot" scenarios from AR6. One can question whether they were ever feasible, but they now involve time travel.
3/
September 2, 2026 at 7:06 AM
"Overshoot" is where you first exceed a threshold (say 1.5C) and return later.
Yes, yes, there are / were no overshoot pathways.
These are the "no overshoot" scenarios from AR6. One can question whether they were ever feasible, but they now involve time travel.
3/
Yes, yes, there are / were no overshoot pathways.
These are the "no overshoot" scenarios from AR6. One can question whether they were ever feasible, but they now involve time travel.
3/
Reposted by Leon Simons
Sunday 9/6 at 10am on Climate Chat: The Gargantuan Climate Lie with Adam McKay @ghostpanther.bsky.social. A no-holds-barred discussion on the climate lie almost everyone tells & the impact it will have on all our lives.
#ClimateCrisis #DontLookUp
@leonsimons.com
youtu.be/PFU7LqchidY
#ClimateCrisis #DontLookUp
@leonsimons.com
youtu.be/PFU7LqchidY
The Gargantuan Climate Lie with Adam McKay
YouTube video by Climate Chat
youtu.be
September 3, 2026 at 12:16 AM
Sunday 9/6 at 10am on Climate Chat: The Gargantuan Climate Lie with Adam McKay @ghostpanther.bsky.social. A no-holds-barred discussion on the climate lie almost everyone tells & the impact it will have on all our lives.
#ClimateCrisis #DontLookUp
@leonsimons.com
youtu.be/PFU7LqchidY
#ClimateCrisis #DontLookUp
@leonsimons.com
youtu.be/PFU7LqchidY