Leon Simons
@leonsimons.bsky.social
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.bsky.social
· Jun 6
No one should be surprised when a planet that accumulates heat more than twice as fast starts to see temperatures go up more than twice as fast.
This isn't rocket science, but we do need more of these NASA satellites. 🌍🛰
To keep us from going blind.
bsky.app/profile/leon...
This isn't rocket science, but we do need more of these NASA satellites. 🌍🛰
To keep us from going blind.
bsky.app/profile/leon...
Reposted by Leon Simons
Well a) don't denigrate it as a factoid; it is well established (see eg acp.copernicus.org/articles/24/...)
b) appreciate that in general albedo change is currently accelerating warming, and that regardless of any specific policy responses this is something people need to understand
b) appreciate that in general albedo change is currently accelerating warming, and that regardless of any specific policy responses this is something people need to understand
Warming effects of reduced sulfur emissions from shipping
Abstract. The regulation introduced in 2020 that limits the sulfur content in shipping fuel has reduced sulfur emissions over global open oceans by about 80 %. This is expected to have reduced aerosol...
acp.copernicus.org
November 10, 2025 at 10:19 AM
Well a) don't denigrate it as a factoid; it is well established (see eg acp.copernicus.org/articles/24/...)
b) appreciate that in general albedo change is currently accelerating warming, and that regardless of any specific policy responses this is something people need to understand
b) appreciate that in general albedo change is currently accelerating warming, and that regardless of any specific policy responses this is something people need to understand
Many use the word exponential without knowing what it actually means.
One thing that does increase exponentially is the amount of water the air can hold with every degree Celsius (+7%) of temperature increase.
This leads to both more (extreme) evaporation and precipitation.
One thing that does increase exponentially is the amount of water the air can hold with every degree Celsius (+7%) of temperature increase.
This leads to both more (extreme) evaporation and precipitation.
November 10, 2025 at 2:07 AM
Many use the word exponential without knowing what it actually means.
One thing that does increase exponentially is the amount of water the air can hold with every degree Celsius (+7%) of temperature increase.
This leads to both more (extreme) evaporation and precipitation.
One thing that does increase exponentially is the amount of water the air can hold with every degree Celsius (+7%) of temperature increase.
This leads to both more (extreme) evaporation and precipitation.
Reposted by Leon Simons
Starting soon! Sunday 11/9 at 10am on Climate Chat "What Politics Can & Can't Do for climate" with @jigarshahdc.bsky.social. We'll cover a wide range of topics from new energy to why governments find it hard to act on climate.
@leonsimons.bsky.social @bikingmzstacey.bsky.social @radsci.bsky.social
@leonsimons.bsky.social @bikingmzstacey.bsky.social @radsci.bsky.social
Sunday 11/9 at 10am on Climate Chat "What Politics Can & Can't Do for climate" with @jigarshahdc.bsky.social. We will cover a wide range of topics from new energy sources to why administrations find it so hard to act on climate.
#ClimateCrisis #ClimatePolitics
youtube.com/live/P7W2aAN...
#ClimateCrisis #ClimatePolitics
youtube.com/live/P7W2aAN...
What Politics Can & Can't Do for Climate with Jigar Shah
YouTube video by Climate Chat
youtube.com
November 9, 2025 at 5:39 PM
Starting soon! Sunday 11/9 at 10am on Climate Chat "What Politics Can & Can't Do for climate" with @jigarshahdc.bsky.social. We'll cover a wide range of topics from new energy to why governments find it hard to act on climate.
@leonsimons.bsky.social @bikingmzstacey.bsky.social @radsci.bsky.social
@leonsimons.bsky.social @bikingmzstacey.bsky.social @radsci.bsky.social
Reposted by Leon Simons
Woensdag 12 November vertel ik hoe het er voor staat met het klimaat, in mijn vertrouwde Boxtel.
Op zn Brabants.
Het is gratis, wees welkom.
www.brabantscentrum.nl/boxtel/boxte...
Op zn Brabants.
Het is gratis, wees welkom.
www.brabantscentrum.nl/boxtel/boxte...
Leon Simons vertelt hoe het ervoor staat met het klimaat
Klimaatwetenschapper Leon Simons, die in Boxtel bij de vroegere boekhandel Elckerlyc heeft gewerkt, geeft woensdag 12 november vanaf 20.00 uur een lezing in de bibliotheek aan de Burgakker 4. Hij vert...
www.brabantscentrum.nl
November 5, 2025 at 1:11 PM
Woensdag 12 November vertel ik hoe het er voor staat met het klimaat, in mijn vertrouwde Boxtel.
Op zn Brabants.
Het is gratis, wees welkom.
www.brabantscentrum.nl/boxtel/boxte...
Op zn Brabants.
Het is gratis, wees welkom.
www.brabantscentrum.nl/boxtel/boxte...
😔
"even the lower end of the predicted range for 2025 would result in a 3-year average above 1.5°C, according to the ERA5 dataset. This would be the first time that this has occurred in the instrumental period."
@ecmwf.int
@copernicusecmwf.bsky.social
"even the lower end of the predicted range for 2025 would result in a 3-year average above 1.5°C, according to the ERA5 dataset. This would be the first time that this has occurred in the instrumental period."
@ecmwf.int
@copernicusecmwf.bsky.social
November 8, 2025 at 11:41 PM
😔
"even the lower end of the predicted range for 2025 would result in a 3-year average above 1.5°C, according to the ERA5 dataset. This would be the first time that this has occurred in the instrumental period."
@ecmwf.int
@copernicusecmwf.bsky.social
"even the lower end of the predicted range for 2025 would result in a 3-year average above 1.5°C, according to the ERA5 dataset. This would be the first time that this has occurred in the instrumental period."
@ecmwf.int
@copernicusecmwf.bsky.social
Ignoring the tropics because of El Niño/La Niña, the past 12 months show record Sea Surface Temperatures for both hemispheres.
And the acceleration of warming over the Northern Hemisphere is painfully obvious:
And the acceleration of warming over the Northern Hemisphere is painfully obvious:
November 8, 2025 at 11:04 PM
Ignoring the tropics because of El Niño/La Niña, the past 12 months show record Sea Surface Temperatures for both hemispheres.
And the acceleration of warming over the Northern Hemisphere is painfully obvious:
And the acceleration of warming over the Northern Hemisphere is painfully obvious:
Reposted by Leon Simons
Superzellen nehmen zu, das sind die gefährlichsten Gewitter in Europa! Bei 3 Grad zur vorindustriellen Zeit um 50%...Details. #globaleeErhitzung
November 8, 2025 at 9:16 AM
Superzellen nehmen zu, das sind die gefährlichsten Gewitter in Europa! Bei 3 Grad zur vorindustriellen Zeit um 50%...Details. #globaleeErhitzung
'Man who jumped out of an airplane without parachute and who has already hit the ground will overshoot goal not to die, UN said'
November 8, 2025 at 3:56 PM
'Man who jumped out of an airplane without parachute and who has already hit the ground will overshoot goal not to die, UN said'
If our years ran from November to October, 2025 would be the second warmest year on record.
Probably in >100,000 years and potentially much longer.
Sea Surface Temperatures are now likely already higher than during the Eemian warm period, when global sea levels were ~7.5m higher!
Probably in >100,000 years and potentially much longer.
Sea Surface Temperatures are now likely already higher than during the Eemian warm period, when global sea levels were ~7.5m higher!
November 8, 2025 at 3:34 PM
If our years ran from November to October, 2025 would be the second warmest year on record.
Probably in >100,000 years and potentially much longer.
Sea Surface Temperatures are now likely already higher than during the Eemian warm period, when global sea levels were ~7.5m higher!
Probably in >100,000 years and potentially much longer.
Sea Surface Temperatures are now likely already higher than during the Eemian warm period, when global sea levels were ~7.5m higher!
Reposted by Leon Simons
Sunday 11/9 at 10am on Climate Chat "What Politics Can & Can't Do for climate" with @jigarshahdc.bsky.social. We will cover a wide range of topics from new energy sources to why administrations find it so hard to act on climate.
#ClimateCrisis #ClimatePolitics
youtube.com/live/P7W2aAN...
#ClimateCrisis #ClimatePolitics
youtube.com/live/P7W2aAN...
What Politics Can & Can't Do for Climate with Jigar Shah
YouTube video by Climate Chat
youtube.com
November 8, 2025 at 7:12 AM
Sunday 11/9 at 10am on Climate Chat "What Politics Can & Can't Do for climate" with @jigarshahdc.bsky.social. We will cover a wide range of topics from new energy sources to why administrations find it so hard to act on climate.
#ClimateCrisis #ClimatePolitics
youtube.com/live/P7W2aAN...
#ClimateCrisis #ClimatePolitics
youtube.com/live/P7W2aAN...
The fact that the Netherlands (18 million inhabitants, ~at 52°N) has more solar installed than all of Africa (1,561 million inhabitants, entirely in the sunbelt) is a gross failure of humanity.
November 8, 2025 at 11:31 AM
The fact that the Netherlands (18 million inhabitants, ~at 52°N) has more solar installed than all of Africa (1,561 million inhabitants, entirely in the sunbelt) is a gross failure of humanity.
'You wanna hear something crazy?'
Joe Rogan learned about our research.
I have some notes:
Joe Rogan learned about our research.
I have some notes:
November 7, 2025 at 8:19 PM
'You wanna hear something crazy?'
Joe Rogan learned about our research.
I have some notes:
Joe Rogan learned about our research.
I have some notes:
Reposted by Leon Simons
Climate talk in Helsinki at request of young people standing up for their future - mailchi.mp/caa/a-climat...
Also available on Substack: jimehansen.substack.com/p/a-climate-...
Video: drive.google.com/file/d/1NGOp...
Also available on Substack: jimehansen.substack.com/p/a-climate-...
Video: drive.google.com/file/d/1NGOp...
November 7, 2025 at 3:03 PM
Climate talk in Helsinki at request of young people standing up for their future - mailchi.mp/caa/a-climat...
Also available on Substack: jimehansen.substack.com/p/a-climate-...
Video: drive.google.com/file/d/1NGOp...
Also available on Substack: jimehansen.substack.com/p/a-climate-...
Video: drive.google.com/file/d/1NGOp...
'Reduced aerosol pollution diminished cloud reflectivity over the North Atlantic and Northeast Pacific'
Much more in observations than in CMIP6 climate models!:
1/
Much more in observations than in CMIP6 climate models!:
1/
November 6, 2025 at 12:08 AM
'Reduced aerosol pollution diminished cloud reflectivity over the North Atlantic and Northeast Pacific'
Much more in observations than in CMIP6 climate models!:
1/
Much more in observations than in CMIP6 climate models!:
1/
Does anyone remember the Kyoto protocol?
Words are cheap.
Words are cheap.
November 5, 2025 at 8:35 PM
Does anyone remember the Kyoto protocol?
Words are cheap.
Words are cheap.
Irrespective of their amount of skin melanin or gender identity, I don't know anyone who's happy about being right about predicting the indifference of humanity to reduce greenhouse gas emissions.
As @drjamesehansen.bsky.social explains, greenhouse gas forcing increase is still close to RCP8.5:
As @drjamesehansen.bsky.social explains, greenhouse gas forcing increase is still close to RCP8.5:
November 5, 2025 at 3:04 PM
Irrespective of their amount of skin melanin or gender identity, I don't know anyone who's happy about being right about predicting the indifference of humanity to reduce greenhouse gas emissions.
As @drjamesehansen.bsky.social explains, greenhouse gas forcing increase is still close to RCP8.5:
As @drjamesehansen.bsky.social explains, greenhouse gas forcing increase is still close to RCP8.5:
Woensdag 12 November vertel ik hoe het er voor staat met het klimaat, in mijn vertrouwde Boxtel.
Op zn Brabants.
Het is gratis, wees welkom.
www.brabantscentrum.nl/boxtel/boxte...
Op zn Brabants.
Het is gratis, wees welkom.
www.brabantscentrum.nl/boxtel/boxte...
Leon Simons vertelt hoe het ervoor staat met het klimaat
Klimaatwetenschapper Leon Simons, die in Boxtel bij de vroegere boekhandel Elckerlyc heeft gewerkt, geeft woensdag 12 november vanaf 20.00 uur een lezing in de bibliotheek aan de Burgakker 4. Hij vert...
www.brabantscentrum.nl
November 5, 2025 at 1:11 PM
Woensdag 12 November vertel ik hoe het er voor staat met het klimaat, in mijn vertrouwde Boxtel.
Op zn Brabants.
Het is gratis, wees welkom.
www.brabantscentrum.nl/boxtel/boxte...
Op zn Brabants.
Het is gratis, wees welkom.
www.brabantscentrum.nl/boxtel/boxte...
As if it wasn't 'bad enough' already, climate models underestimate future Ocean Heat Uptake, because them get present-day Antarctic sea-ice wrong.
One more reason why climate change will be worse than models project..
One more reason why climate change will be worse than models project..
November 5, 2025 at 11:34 AM
As if it wasn't 'bad enough' already, climate models underestimate future Ocean Heat Uptake, because them get present-day Antarctic sea-ice wrong.
One more reason why climate change will be worse than models project..
One more reason why climate change will be worse than models project..
Reposted by Leon Simons
Correction, that was 2022.
Here is a quick graph of October 2025 Northern Hemisphere mid-latitudes and Tropical Sea Surface Temperatures.
It's like a permanent Super El Niño has materialized over the Northern Hemisphere mid-latitudes over the past 10 years..
bsky.app/profile/leon...
Here is a quick graph of October 2025 Northern Hemisphere mid-latitudes and Tropical Sea Surface Temperatures.
It's like a permanent Super El Niño has materialized over the Northern Hemisphere mid-latitudes over the past 10 years..
bsky.app/profile/leon...
November 4, 2025 at 11:12 PM
Correction, that was 2022.
Here is a quick graph of October 2025 Northern Hemisphere mid-latitudes and Tropical Sea Surface Temperatures.
It's like a permanent Super El Niño has materialized over the Northern Hemisphere mid-latitudes over the past 10 years..
bsky.app/profile/leon...
Here is a quick graph of October 2025 Northern Hemisphere mid-latitudes and Tropical Sea Surface Temperatures.
It's like a permanent Super El Niño has materialized over the Northern Hemisphere mid-latitudes over the past 10 years..
bsky.app/profile/leon...
The Global Average Sea Surface Temperature is now very similar to 2015.
See if you can spot some regional differences:
1/2
See if you can spot some regional differences:
1/2
November 4, 2025 at 5:17 PM
The Global Average Sea Surface Temperature is now very similar to 2015.
See if you can spot some regional differences:
1/2
See if you can spot some regional differences:
1/2
This underscores how toxic and dangerous the smearing and gatekeeping campaigns by certain outspoken climate scientists are with regards to SRM research.
Without ample research, dangerous geoengineering schemes could do much more harm than good.
We need to reduce climate risks
See link below
Without ample research, dangerous geoengineering schemes could do much more harm than good.
We need to reduce climate risks
See link below
November 4, 2025 at 3:25 PM
This underscores how toxic and dangerous the smearing and gatekeeping campaigns by certain outspoken climate scientists are with regards to SRM research.
Without ample research, dangerous geoengineering schemes could do much more harm than good.
We need to reduce climate risks
See link below
Without ample research, dangerous geoengineering schemes could do much more harm than good.
We need to reduce climate risks
See link below
Reposted by Leon Simons
Can you answer this question?:
'What are the assumed Non-CO2 GHG and aerosol and therefore the net forcings?'
This is crucial to to determine the validity of a graph like this and the links you share do not provide an answer.
'What are the assumed Non-CO2 GHG and aerosol and therefore the net forcings?'
This is crucial to to determine the validity of a graph like this and the links you share do not provide an answer.
November 3, 2025 at 1:21 AM
Can you answer this question?:
'What are the assumed Non-CO2 GHG and aerosol and therefore the net forcings?'
This is crucial to to determine the validity of a graph like this and the links you share do not provide an answer.
'What are the assumed Non-CO2 GHG and aerosol and therefore the net forcings?'
This is crucial to to determine the validity of a graph like this and the links you share do not provide an answer.
Reposted by Leon Simons
Since 2020, the global ocean has been on fire - even as Nino 3.4 has often been cool.
November 4, 2025 at 6:26 AM
Since 2020, the global ocean has been on fire - even as Nino 3.4 has often been cool.
Reposted by Leon Simons
Harm Edens presenteert BNR duurzaam, met verve. Vandaag had hij @leonsimons.bsky.social aan tafel, die vertelt over de versnelling in de opwarming, wat de gevolgen zijn, en wat we moeten doen. Edens is snel, luchtig, op de hoogte. Dit hoor je zelden, op de radio!
👇👌
www.bnr.nl/podcast/duur...
👇👌
www.bnr.nl/podcast/duur...
3 graden warmer in 2050 is nu een reëel scenario
De aarde warmt veel sneller op dan gedacht. Klimaatexpert Leon Simons legt uit waarom we al binnen 25 jaar drie graden opwarming kunnen bereiken, als we nie...
www.bnr.nl
November 3, 2025 at 9:09 PM
Harm Edens presenteert BNR duurzaam, met verve. Vandaag had hij @leonsimons.bsky.social aan tafel, die vertelt over de versnelling in de opwarming, wat de gevolgen zijn, en wat we moeten doen. Edens is snel, luchtig, op de hoogte. Dit hoor je zelden, op de radio!
👇👌
www.bnr.nl/podcast/duur...
👇👌
www.bnr.nl/podcast/duur...
Is there anything AI can't do? 🤦♂️
'Make energy 100X cheaper in 20 years'
Microsoft AI CEO Mustafa Suleyman
'A large solar-powered AI satellite constellation would be able to prevent global warming by making tiny adjustments in how much solar energy reached Earth'
Elon Musk
They can't grasp this:
'Make energy 100X cheaper in 20 years'
Microsoft AI CEO Mustafa Suleyman
'A large solar-powered AI satellite constellation would be able to prevent global warming by making tiny adjustments in how much solar energy reached Earth'
Elon Musk
They can't grasp this:
November 3, 2025 at 8:38 PM
Is there anything AI can't do? 🤦♂️
'Make energy 100X cheaper in 20 years'
Microsoft AI CEO Mustafa Suleyman
'A large solar-powered AI satellite constellation would be able to prevent global warming by making tiny adjustments in how much solar energy reached Earth'
Elon Musk
They can't grasp this:
'Make energy 100X cheaper in 20 years'
Microsoft AI CEO Mustafa Suleyman
'A large solar-powered AI satellite constellation would be able to prevent global warming by making tiny adjustments in how much solar energy reached Earth'
Elon Musk
They can't grasp this: