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)!
Milky Way money shot
February 15, 2026 at 1:00 AM
Milky Way money shot
"If only the Endangerment Finding had considered the potential BENEFITS of GHG emissions!" 🙄
February 13, 2026 at 2:39 PM
"If only the Endangerment Finding had considered the potential BENEFITS of GHG emissions!" 🙄
This is roughly how scientists think global mean surface temperatures would have evolved since 1950 *without* human influence (almost negligible change - a fraction of a degree of cooling on average). Instead, we’ve seen more than a full degree increase in average temperatures.
February 12, 2026 at 7:21 PM
This is roughly how scientists think global mean surface temperatures would have evolved since 1950 *without* human influence (almost negligible change - a fraction of a degree of cooling on average). Instead, we’ve seen more than a full degree increase in average temperatures.
Reposted by Ryan Katz-Rosene, PhD
The percentage area of the contiguous US experiencing "VERY WARM" temperatures (in red - defined as areas in the top 10% of their historical distribution) and "VERY COLD" (in blue; showing the bottom 10%) for *each month of the year*, from 1895 to 2025.
February 11, 2026 at 3:14 AM
The percentage area of the contiguous US experiencing "VERY WARM" temperatures (in red - defined as areas in the top 10% of their historical distribution) and "VERY COLD" (in blue; showing the bottom 10%) for *each month of the year*, from 1895 to 2025.
The percentage area of the contiguous US experiencing "VERY WARM" temperatures (in red - defined as areas in the top 10% of their historical distribution) and "VERY COLD" (in blue; showing the bottom 10%) for *each month of the year*, from 1895 to 2025.
February 11, 2026 at 3:14 AM
The percentage area of the contiguous US experiencing "VERY WARM" temperatures (in red - defined as areas in the top 10% of their historical distribution) and "VERY COLD" (in blue; showing the bottom 10%) for *each month of the year*, from 1895 to 2025.
A mini thread on warming across the Contiguous US based on some nice NOAA figures I just came across. This first one defies a common climate skeptic talking point about max temps:
February 10, 2026 at 4:25 AM
A mini thread on warming across the Contiguous US based on some nice NOAA figures I just came across. This first one defies a common climate skeptic talking point about max temps:
"Human influence, in particular greenhouse gas emissions, is likely the main driver of the observed global-scale intensification of heavy precipitation over land regions." - IPCC AR6, Chapter 11.
Grazalema, Spain, received over 2,000 mm (78 inches) of rain in just the last 20 days.
Over a year’s worth of rain — and it’s only early February. This is hydrologically absurd.
Over a year’s worth of rain — and it’s only early February. This is hydrologically absurd.
February 9, 2026 at 5:10 PM
"Human influence, in particular greenhouse gas emissions, is likely the main driver of the observed global-scale intensification of heavy precipitation over land regions." - IPCC AR6, Chapter 11.
On CO2 saturation… thetradeoff.substack.com/p/the-co2-sa...
The 'CO2 Saturation' Myth is an Old Ghost
Let it Rest in Peace Already!
thetradeoff.substack.com
February 8, 2026 at 8:07 PM
On CO2 saturation… thetradeoff.substack.com/p/the-co2-sa...
"The current flippant attitude – 1.5°C isn’t so bad, we can deal with 3°C – of people who should know better will dissolve, if we can improve understanding of the danger of passing the point of no return."
open.substack.com/pub/jimehans...
open.substack.com/pub/jimehans...
Another El Nino Already? What Can We Learn from It?
James Hansen, Pushker Kharecha, Dylan Morgan and Jasen Vest
open.substack.com
February 6, 2026 at 11:07 PM
"The current flippant attitude – 1.5°C isn’t so bad, we can deal with 3°C – of people who should know better will dissolve, if we can improve understanding of the danger of passing the point of no return."
open.substack.com/pub/jimehans...
open.substack.com/pub/jimehans...
Reposted by Ryan Katz-Rosene, PhD
The US electricity grid has gone from 73% to 58% fossil-powered over the last 40 years.
China's electricity grid has gone from 78% to 62% fossil-powered over the last 40 years.
Which do you think will decarbonize electricity first?
China's electricity grid has gone from 78% to 62% fossil-powered over the last 40 years.
Which do you think will decarbonize electricity first?
February 6, 2026 at 10:01 PM
The US electricity grid has gone from 73% to 58% fossil-powered over the last 40 years.
China's electricity grid has gone from 78% to 62% fossil-powered over the last 40 years.
Which do you think will decarbonize electricity first?
China's electricity grid has gone from 78% to 62% fossil-powered over the last 40 years.
Which do you think will decarbonize electricity first?
February 6, 2026 at 9:59 PM
The US electricity grid has gone from 73% to 58% fossil-powered over the last 40 years.
China's electricity grid has gone from 78% to 62% fossil-powered over the last 40 years.
Which do you think will decarbonize electricity first?
China's electricity grid has gone from 78% to 62% fossil-powered over the last 40 years.
Which do you think will decarbonize electricity first?
China's decarbonizing its transport sector WAY FASTER than the US.
February 6, 2026 at 2:29 PM
China's decarbonizing its transport sector WAY FASTER than the US.
"the population experiencing extreme heat... is projected to nearly double if the 2.0 °C threshold is reached, increasing from 23% (1.54B people) in 2010 to 41% (3.79B) by 2050, with the largest projected populations affected in India, Nigeria, Indonesia, Bangladesh, Pakistan and the Philippines."
February 6, 2026 at 2:20 PM
"the population experiencing extreme heat... is projected to nearly double if the 2.0 °C threshold is reached, increasing from 23% (1.54B people) in 2010 to 41% (3.79B) by 2050, with the largest projected populations affected in India, Nigeria, Indonesia, Bangladesh, Pakistan and the Philippines."
We emit about 42Gt CO2 per year.
February 5, 2026 at 11:47 PM
We emit about 42Gt CO2 per year.
There’s currently a 61°C temperature differential between the warmest and coldest places in Canada
February 5, 2026 at 7:38 PM
There’s currently a 61°C temperature differential between the warmest and coldest places in Canada
Surprising no-one (but at least the data to back it up): EV rebates help drive EV sales...
February 5, 2026 at 3:40 PM
Surprising no-one (but at least the data to back it up): EV rebates help drive EV sales...
The new report “Recalibrating Climate Risk” calls for - among other things- rethinking how we discuss the economic costs of climate change. Seems reasonable to me…
(I would say the same thing about mortality rates).
(I would say the same thing about mortality rates).
February 5, 2026 at 2:04 PM
The new report “Recalibrating Climate Risk” calls for - among other things- rethinking how we discuss the economic costs of climate change. Seems reasonable to me…
(I would say the same thing about mortality rates).
(I would say the same thing about mortality rates).
In map form (care of Bloomberg):
TL;DR: The snow is melting
TL;DR: The snow is melting
February 4, 2026 at 6:43 PM
In map form (care of Bloomberg):
TL;DR: The snow is melting
TL;DR: The snow is melting
"Nearly half the places that once hosted the Winter Olympics may not have the right climate conditions to ever do it again."
www.cbc.ca/player/play/...
www.cbc.ca/player/play/...
How a warming climate is changing the Winter Olympics
Nearly half the places that once hosted the Winter Olympics may not have the right climate conditions to ever do it again. For The National, CBC News chief correspondent Adrienne Arsenault travels hig...
www.cbc.ca
February 4, 2026 at 2:21 AM
"Nearly half the places that once hosted the Winter Olympics may not have the right climate conditions to ever do it again."
www.cbc.ca/player/play/...
www.cbc.ca/player/play/...
The 2025 Global Change Outlook projects that current trends will lead to an insane 3.72C of warming by 2150 (and 2.74C by 2100).
A much more ambitious "accelerated actions" pathway (GHG emissions more than halved over the next quarter Century) could keep warming below 2C.
A much more ambitious "accelerated actions" pathway (GHG emissions more than halved over the next quarter Century) could keep warming below 2C.
February 3, 2026 at 2:17 PM
The 2025 Global Change Outlook projects that current trends will lead to an insane 3.72C of warming by 2150 (and 2.74C by 2100).
A much more ambitious "accelerated actions" pathway (GHG emissions more than halved over the next quarter Century) could keep warming below 2C.
A much more ambitious "accelerated actions" pathway (GHG emissions more than halved over the next quarter Century) could keep warming below 2C.
The farm life, Winter 2026 edition
February 2, 2026 at 9:00 PM
The farm life, Winter 2026 edition
What kind of tracks are these? Something popped out of the snow scampered across the surface made a hole, came back out and did the same thing again…
February 2, 2026 at 8:04 PM
What kind of tracks are these? Something popped out of the snow scampered across the surface made a hole, came back out and did the same thing again…
Cutting your manuscript down to the word limit… only to have it desk rejected
February 2, 2026 at 6:02 PM
Cutting your manuscript down to the word limit… only to have it desk rejected
This is what I'm talkin' about!👇 When I was a kid global CO2 levels peaked in April or May. Now they peak in December every year.
February 2, 2026 at 5:01 PM
This is what I'm talkin' about!👇 When I was a kid global CO2 levels peaked in April or May. Now they peak in December every year.