Ryan Katz-Rosene, PhD
@ryankatzrosene.bsky.social
Professor studying contentious CLIMATE POLITICS. Especially interested in aviation/high-speed rail; nuclear; green/de-growth; meat production/consumption; and all things Canada🇨🇦. Co-Host http://EcopoliticsPodcast.ca Views are my own (not my employer's)!
Visual from Zack Labe. Average sea-ice thickness near the North Pole.
In the 80s and 90s it never dipped below 2 meters.
In 2025 it dipped below 1.3 meters.
When will it hit zero?
In the 80s and 90s it never dipped below 2 meters.
In 2025 it dipped below 1.3 meters.
When will it hit zero?
January 4, 2026 at 10:03 PM
Visual from Zack Labe. Average sea-ice thickness near the North Pole.
In the 80s and 90s it never dipped below 2 meters.
In 2025 it dipped below 1.3 meters.
When will it hit zero?
In the 80s and 90s it never dipped below 2 meters.
In 2025 it dipped below 1.3 meters.
When will it hit zero?
It’s not uncommon to find a turkey feather when out on my daily ski, but today I found a whole wing!
(It was mostly submerged in snow when I came across it)
(It was mostly submerged in snow when I came across it)
January 4, 2026 at 9:27 PM
It’s not uncommon to find a turkey feather when out on my daily ski, but today I found a whole wing!
(It was mostly submerged in snow when I came across it)
(It was mostly submerged in snow when I came across it)
It's technically true what they say: As a Flow Gas, Anthropogenic Methane wouldn't contribute much to global warming if emissions held steady for about 12 years. There's only one problem...
January 3, 2026 at 7:52 PM
It's technically true what they say: As a Flow Gas, Anthropogenic Methane wouldn't contribute much to global warming if emissions held steady for about 12 years. There's only one problem...
This is the third paragraph of the 'Results' section of the Structured Abstract in Judd et al. 2024 (you know, the 485 million year history of Earth's mean temperature that Skeptics LOVE to misuse). It's amazing how many DENIER MYTHS are obliterated in this one paragraph 👇
January 3, 2026 at 3:11 PM
This is the third paragraph of the 'Results' section of the Structured Abstract in Judd et al. 2024 (you know, the 485 million year history of Earth's mean temperature that Skeptics LOVE to misuse). It's amazing how many DENIER MYTHS are obliterated in this one paragraph 👇
I've added 2025 to this ridiculous chart
January 3, 2026 at 12:13 AM
I've added 2025 to this ridiculous chart
Humanity emitted more Greenhouse Gases in 2025 than any year ever
January 2, 2026 at 12:34 AM
Humanity emitted more Greenhouse Gases in 2025 than any year ever
Why 2026 is unlikely to set a new record for Warmest Year:
open.substack.com/pub/thetrade...
open.substack.com/pub/thetrade...
2024 Holds On As Warmest Year on Record...
How long will this last?
open.substack.com
January 2, 2026 at 12:07 AM
Why 2026 is unlikely to set a new record for Warmest Year:
open.substack.com/pub/thetrade...
open.substack.com/pub/thetrade...
Woah this place is awesome! 6km of forested skating trails🤩
January 1, 2026 at 10:03 PM
Woah this place is awesome! 6km of forested skating trails🤩
One aurora shot I took from each month in 2025 - from my home at 45.68°North. On my iPhone.
January 1, 2026 at 5:10 AM
One aurora shot I took from each month in 2025 - from my home at 45.68°North. On my iPhone.
My best pic from each month of 2025 (auroras excluded). Happy New Year everyone!
December 31, 2025 at 10:13 PM
My best pic from each month of 2025 (auroras excluded). Happy New Year everyone!
🥇2024 will hold onto 1st place for warmest year in the modern record. How *long* will this record last?
We don't know... but a safe bet, IMHO, is 3 years (i.e. 2027 likely to set a new record). Here's why👇
We don't know... but a safe bet, IMHO, is 3 years (i.e. 2027 likely to set a new record). Here's why👇
December 31, 2025 at 5:29 PM
🥇2024 will hold onto 1st place for warmest year in the modern record. How *long* will this record last?
We don't know... but a safe bet, IMHO, is 3 years (i.e. 2027 likely to set a new record). Here's why👇
We don't know... but a safe bet, IMHO, is 3 years (i.e. 2027 likely to set a new record). Here's why👇
Sigh... "A former Cold War fallout shelter in rural Nova Scotia is being transformed into luxury condominiums for elite clients seeking refuge from global crises."
[What do these elites think they'll find when they surface for air? Do they imagine grocery stores stocked with full shelves?]
[What do these elites think they'll find when they surface for air? Do they imagine grocery stores stocked with full shelves?]
December 30, 2025 at 3:34 PM
Sigh... "A former Cold War fallout shelter in rural Nova Scotia is being transformed into luxury condominiums for elite clients seeking refuge from global crises."
[What do these elites think they'll find when they surface for air? Do they imagine grocery stores stocked with full shelves?]
[What do these elites think they'll find when they surface for air? Do they imagine grocery stores stocked with full shelves?]
1) Generally speaking, global warming is causing both precipitation AND evaporation to intensify. This figure (from Ficklin et al 2022), shows the expected change by late Century in precipitation intensity (top panel), and similarly the change in evaporative demand (bottom panel)
December 30, 2025 at 2:30 PM
1) Generally speaking, global warming is causing both precipitation AND evaporation to intensify. This figure (from Ficklin et al 2022), shows the expected change by late Century in precipitation intensity (top panel), and similarly the change in evaporative demand (bottom panel)
The current policies for the international aviation sector put it on a trajectory where sectoral CO2 emissions in 2050 will be nearly *double* the threshold for a "Critically Insufficient" rating. I think they should come up with a new category, "Catastrophically Failing".
December 30, 2025 at 2:28 PM
The current policies for the international aviation sector put it on a trajectory where sectoral CO2 emissions in 2050 will be nearly *double* the threshold for a "Critically Insufficient" rating. I think they should come up with a new category, "Catastrophically Failing".
My response to a recent post by Zizek claiming Communism is the only answer to ecological crises: open.substack.com/pub/thetrade...
December 29, 2025 at 4:51 PM
My response to a recent post by Zizek claiming Communism is the only answer to ecological crises: open.substack.com/pub/thetrade...
It's been a dream of mine since I was a kid to go to a FIFA World Cup soccer game live some day. Next June my 'home team' is playing, just a few hours' drive away ...
But tickets for nosebleeders are CDN $2,364 ... each! 😭
Think I'll watch with friends and family at home, thanks!😅
But tickets for nosebleeders are CDN $2,364 ... each! 😭
Think I'll watch with friends and family at home, thanks!😅
December 28, 2025 at 3:19 AM
It's been a dream of mine since I was a kid to go to a FIFA World Cup soccer game live some day. Next June my 'home team' is playing, just a few hours' drive away ...
But tickets for nosebleeders are CDN $2,364 ... each! 😭
Think I'll watch with friends and family at home, thanks!😅
But tickets for nosebleeders are CDN $2,364 ... each! 😭
Think I'll watch with friends and family at home, thanks!😅
Interesting. A couple months ago 2025 was tracking to be one of the lowest burn area years globally since 2012. But an uptick in wildfire burn area in Africa in recent weeks has put 2025 back toward the mean...
December 28, 2025 at 2:22 AM
Interesting. A couple months ago 2025 was tracking to be one of the lowest burn area years globally since 2012. But an uptick in wildfire burn area in Africa in recent weeks has put 2025 back toward the mean...
meanwhile, at the other place... the quality of the discourse is really something else.
December 28, 2025 at 12:09 AM
meanwhile, at the other place... the quality of the discourse is really something else.
"The slowdown in the September Arctic sea ice melt is likely to continue until 2030–2040. Nevertheless, a phase of accelerated Arctic sea ice decline may ensue when the NAO passes the peak positive phase after 2030–2040." www.nature.com/articles/s41...
December 26, 2025 at 10:14 PM
"The slowdown in the September Arctic sea ice melt is likely to continue until 2030–2040. Nevertheless, a phase of accelerated Arctic sea ice decline may ensue when the NAO passes the peak positive phase after 2030–2040." www.nature.com/articles/s41...
For Xmas I’m breaking up with OpenAI. Done with their chatbot’s incessant bullshit. chatGPT being used for harm in so many ways. I’m out.
December 25, 2025 at 6:45 PM
For Xmas I’m breaking up with OpenAI. Done with their chatbot’s incessant bullshit. chatGPT being used for harm in so many ways. I’m out.
My latest newsletter muses about what the intensification of the hydrological cycle could mean for my community in the future...
open.substack.com/pub/thetrade...
open.substack.com/pub/thetrade...
Parched! Can the Gatineau Hills be facing more drought AND more extreme rainfall at the same time!?
It's not impossible...
open.substack.com
December 24, 2025 at 7:59 PM
My latest newsletter muses about what the intensification of the hydrological cycle could mean for my community in the future...
open.substack.com/pub/thetrade...
open.substack.com/pub/thetrade...
This is some creepy shit
December 24, 2025 at 2:49 PM
This is some creepy shit
New paper just dropped about sticks and carrots in climate policy: “Policy carrots alone do not dramatically reduce future emissions. Only with policy sticks are there unambiguous signals to substantially shrink the size of incumbent fossil fuel industries.”
December 23, 2025 at 10:00 PM
New paper just dropped about sticks and carrots in climate policy: “Policy carrots alone do not dramatically reduce future emissions. Only with policy sticks are there unambiguous signals to substantially shrink the size of incumbent fossil fuel industries.”
"Global EV sales are up 21% this year, with every region posting double-digit growth except North America, which saw a 1% decline. A new Leger poll confirms that the high upfront cost of EVs remains the top barrier for Canadians..." - Clean Energy Canada
December 22, 2025 at 3:04 PM
"Global EV sales are up 21% this year, with every region posting double-digit growth except North America, which saw a 1% decline. A new Leger poll confirms that the high upfront cost of EVs remains the top barrier for Canadians..." - Clean Energy Canada
The North American temperature anomaly forecast map for around XMas is something to behold!
December 21, 2025 at 2:52 PM
The North American temperature anomaly forecast map for around XMas is something to behold!