Dan Miller
@danmiller999.bsky.social
ClimateTech VC. Postings on climate change, CDR, SRM, climate policy & pinball. Host of Climate Chat on YouTube: https://www.youtube.com/@climatechat/streams
This, of course, will *reduce* temperature increases (at least in the short run)!
The IMO's 2020 reduction in sulfur emissions led to the dramatic increase in temperatures since 2023!
The IMO's 2020 reduction in sulfur emissions led to the dramatic increase in temperatures since 2023!
October 18, 2025 at 8:45 PM
This, of course, will *reduce* temperature increases (at least in the short run)!
The IMO's 2020 reduction in sulfur emissions led to the dramatic increase in temperatures since 2023!
The IMO's 2020 reduction in sulfur emissions led to the dramatic increase in temperatures since 2023!
While I agree that he was glossing over what Kirk's real work was, what Newsom said he wants to continue is:
October 12, 2025 at 4:12 AM
While I agree that he was glossing over what Kirk's real work was, what Newsom said he wants to continue is:
You might be surprised, but I'm all for draconian measures to reduce emissions, but I think we should actually phase out fossil fuels instead of asking the public to go to a wartime economy (though I do think that could be helpful *if* it could be done politically).
August 29, 2025 at 7:21 AM
You might be surprised, but I'm all for draconian measures to reduce emissions, but I think we should actually phase out fossil fuels instead of asking the public to go to a wartime economy (though I do think that could be helpful *if* it could be done politically).
Growth did slow but it would inevitably grow. Think of energy efficiency as lower cost. Lower the cost of your product & you will sell more. Jevons Paradox applies to anything (inc. energy & computation) that has insatiable demand at the right price.
August 26, 2025 at 6:07 PM
Growth did slow but it would inevitably grow. Think of energy efficiency as lower cost. Lower the cost of your product & you will sell more. Jevons Paradox applies to anything (inc. energy & computation) that has insatiable demand at the right price.
Also, the recent acceleration in warming in 2023/24 imply both a high ECS & large cooling impact from aerosols, especially aerosols emitted over the oceans. This & the albedo change imply an ECS of 4.5ºC.
7/X
7/X
August 6, 2025 at 7:54 AM
Also, the recent acceleration in warming in 2023/24 imply both a high ECS & large cooling impact from aerosols, especially aerosols emitted over the oceans. This & the albedo change imply an ECS of 4.5ºC.
7/X
7/X
Satellite observations show that the Earth albedo (reflectivity) dropped 0.5% in the past 25 years year - a huge amount! The change is due to less sea ice, less aerosols (coal & ship smoke) creating fewer clouds, & less clouds due to global warming.
6/X
6/X
August 6, 2025 at 7:54 AM
Satellite observations show that the Earth albedo (reflectivity) dropped 0.5% in the past 25 years year - a huge amount! The change is due to less sea ice, less aerosols (coal & ship smoke) creating fewer clouds, & less clouds due to global warming.
6/X
6/X
GHG forcing: 1/3rd of the warming in the first 10 years, the second third in the next 100 years, and the final third in the next ~1000 years.
July 7, 2025 at 5:00 AM
GHG forcing: 1/3rd of the warming in the first 10 years, the second third in the next 100 years, and the final third in the next ~1000 years.
I agree that "just stopping" cows is the best way to go. That's not happening. I have a 20-point plan that could "easily" be implemented to end FFs quickly. It's also not happening. Do you have suggestions on how to get the world stop eating cows & drinking cow milk?
June 20, 2025 at 5:27 PM
I agree that "just stopping" cows is the best way to go. That's not happening. I have a 20-point plan that could "easily" be implemented to end FFs quickly. It's also not happening. Do you have suggestions on how to get the world stop eating cows & drinking cow milk?
I made a list of some of the reasons why people don't act on climate:
June 7, 2025 at 6:31 AM
I made a list of some of the reasons why people don't act on climate:
Then on Tuesday (special day!) at 10am on Climate Chat: Public Perceptions of Climate Change & Climate Solutions with U. of Michigan professor Kaitlin Raimi:
Link coming soon.
#ClimateChange #ClimateAction
Link coming soon.
#ClimateChange #ClimateAction
May 31, 2025 at 12:50 AM
Then on Tuesday (special day!) at 10am on Climate Chat: Public Perceptions of Climate Change & Climate Solutions with U. of Michigan professor Kaitlin Raimi:
Link coming soon.
#ClimateChange #ClimateAction
Link coming soon.
#ClimateChange #ClimateAction
The reason solar hasn't replaced FF is because there is no requirement to do so. We could easily implement polices that require the phase out of fossil fuels. We choose not to do so for many reasons. I wrote some of them down:
April 29, 2025 at 1:40 AM
The reason solar hasn't replaced FF is because there is no requirement to do so. We could easily implement polices that require the phase out of fossil fuels. We choose not to do so for many reasons. I wrote some of them down:
Renewables didn't replace fossil fuels (FF) because there was no policy to do so. The policy was to subsidize RE so we got more RE. I would implement policies that require the phase out of FF (and plastics that can break down in the environment to harmful substances).
April 29, 2025 at 1:36 AM
Renewables didn't replace fossil fuels (FF) because there was no policy to do so. The policy was to subsidize RE so we got more RE. I would implement policies that require the phase out of FF (and plastics that can break down in the environment to harmful substances).
We also need policies to phase out fossil fuels. They are rather simple, but politicians won't even talk about the obvious policies:
April 25, 2025 at 5:04 AM
We also need policies to phase out fossil fuels. They are rather simple, but politicians won't even talk about the obvious policies:
Here is Hansen's explanation:
April 4, 2025 at 7:20 AM
Here is Hansen's explanation:
With high ECS, “fast” & “slow” feedbacks have overlapping timescales. This impacts sea ice area, which is near a minimum during the satellite coverage era (since 1979) in both hemispheres.
6/X
6/X
April 3, 2025 at 5:34 AM
With high ECS, “fast” & “slow” feedbacks have overlapping timescales. This impacts sea ice area, which is near a minimum during the satellite coverage era (since 1979) in both hemispheres.
6/X
6/X
This is from a Scientific American newsletter. Do you agree with it? I think it gives the wrong impression and will lessen efforts to prevent an AMOC collapse. And as Stefan points out, much of this is about semantics, not science.
February 28, 2025 at 9:20 PM
This is from a Scientific American newsletter. Do you agree with it? I think it gives the wrong impression and will lessen efforts to prevent an AMOC collapse. And as Stefan points out, much of this is about semantics, not science.
Also, I assume you disagree with James Hansen when he says in his "Global Warming is Accelerating" paper:
February 28, 2025 at 4:42 PM
Also, I assume you disagree with James Hansen when he says in his "Global Warming is Accelerating" paper:
Here is Stefan's easy-to-understand summary of the situation:
February 28, 2025 at 4:28 PM
Here is Stefan's easy-to-understand summary of the situation:
Here is Stefan's easy-to-understand summary of the situation:
February 28, 2025 at 4:24 PM
Here is Stefan's easy-to-understand summary of the situation:
From James Hansen's recent "Global Warming Has Accelerated" paper:
www.tandfonline.com/doi/full/10....
www.tandfonline.com/doi/full/10....
February 28, 2025 at 12:03 AM
From James Hansen's recent "Global Warming Has Accelerated" paper:
www.tandfonline.com/doi/full/10....
www.tandfonline.com/doi/full/10....
If the IPCC is correct & ECS is 3ºC, then ship aerosol forcing is complete in 2025. But if ECS is 4.8ºC as Hansen says, then the warming from ships will continue longer & offset La Niña cooling.
7/X
7/X
February 21, 2025 at 2:30 AM
If the IPCC is correct & ECS is 3ºC, then ship aerosol forcing is complete in 2025. But if ECS is 4.8ºC as Hansen says, then the warming from ships will continue longer & offset La Niña cooling.
7/X
7/X
Warming due to a forcing does not depend much on ECS in 1st few years because that warming is due mostly to the original forcing & not feedbacks. But within a decade or 2, the feedbacks kick in & we see the effects of the high ECS.
6/X
6/X
February 21, 2025 at 2:29 AM
Warming due to a forcing does not depend much on ECS in 1st few years because that warming is due mostly to the original forcing & not feedbacks. But within a decade or 2, the feedbacks kick in & we see the effects of the high ECS.
6/X
6/X
Unlike previous El Niño cycles (1997-98 & 2015-16), 2024 temps stayed high & did not cool following the El Niño. Hansen believes 2025 will stay high & may even set a record! There are 2 reasons for this:
3/X
3/X
February 21, 2025 at 2:28 AM
Unlike previous El Niño cycles (1997-98 & 2015-16), 2024 temps stayed high & did not cool following the El Niño. Hansen believes 2025 will stay high & may even set a record! There are 2 reasons for this:
3/X
3/X
Claims that we can stay under 2ºC with “Net Zero” are implausible. We are still on the “worst case” RCP8.5 emissions path that will lead to 2~3ºC this century which will lead to “Points of No Return” without different policies.
6/X
6/X
February 5, 2025 at 8:18 AM
Claims that we can stay under 2ºC with “Net Zero” are implausible. We are still on the “worst case” RCP8.5 emissions path that will lead to 2~3ºC this century which will lead to “Points of No Return” without different policies.
6/X
6/X