Jennifer Francis PhD
@jfrancisclimate.bsky.social
Senior Scientist @Woodwell Climate Research Center in Falmouth MA USA. Researching connections between the climate crisis and extreme weather, avid science communicator.
JenniferAFrancis.com
Personal: Sailor, mom, scuba diver...BE NICE
JenniferAFrancis.com
Personal: Sailor, mom, scuba diver...BE NICE
CO2 concentrations haven’t been this high in at least 3 MILLION years. The Earth’s temperature hasn’t yet caught up. We need to quickly and dramatically reduce CO2 emissions, but last year’s were the highest ever.
426.57 parts per million (ppm) CO2 in air 13-Nov-2025
keelingcurve.ucsd.edu
keelingcurve.ucsd.edu
The Keeling Curve
The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.
keelingcurve.ucsd.edu
November 14, 2025 at 5:38 PM
CO2 concentrations haven’t been this high in at least 3 MILLION years. The Earth’s temperature hasn’t yet caught up. We need to quickly and dramatically reduce CO2 emissions, but last year’s were the highest ever.
Our new study linking cold-air outbreaks in the U.S. winter with disruptions in the stratospheric polar vortex:
www.woodwellclimate.org/cold-spell-o...
www.woodwellclimate.org/cold-spell-o...
Cold-air outbreaks continue in a warming world - Woodwell Climate
A new paper from climate researchers highlights the impacts of stratospheric polar vortex behavior on cold spells across the U.S.
www.woodwellclimate.org
August 2, 2025 at 2:57 PM
Our new study linking cold-air outbreaks in the U.S. winter with disruptions in the stratospheric polar vortex:
www.woodwellclimate.org/cold-spell-o...
www.woodwellclimate.org/cold-spell-o...
Reposted by Jennifer Francis PhD
"Study finds planetary waves linked to wild summer weather have tripled since 1950" | Great piece by @borenbears.bsky.social for @apnews.com on our new @pnas.org article (w/ thoughtful comments from @jfrancisclimate.bsky.social):
vancouver.citynews.ca/2025/06/16/s...
vancouver.citynews.ca/2025/06/16/s...
Study: Climate change tripled planetary waves since 1950
Climate change has tripled the frequency of atmospheric wave events linked to extreme summer weather in the last 75 years.
vancouver.citynews.ca
June 16, 2025 at 8:23 PM
"Study finds planetary waves linked to wild summer weather have tripled since 1950" | Great piece by @borenbears.bsky.social for @apnews.com on our new @pnas.org article (w/ thoughtful comments from @jfrancisclimate.bsky.social):
vancouver.citynews.ca/2025/06/16/s...
vancouver.citynews.ca/2025/06/16/s...
Reposted by Jennifer Francis PhD
HAPPY 75th, NSF!
We’re celebrating this milestone by highlighting some of NSF’s most transformative accomplishments—innovations that have shaped our world and continue to drive progress in health, technology, the environment, and beyond.
Read on 🧵(1/11):
We’re celebrating this milestone by highlighting some of NSF’s most transformative accomplishments—innovations that have shaped our world and continue to drive progress in health, technology, the environment, and beyond.
Read on 🧵(1/11):
May 10, 2025 at 8:19 PM
HAPPY 75th, NSF!
We’re celebrating this milestone by highlighting some of NSF’s most transformative accomplishments—innovations that have shaped our world and continue to drive progress in health, technology, the environment, and beyond.
Read on 🧵(1/11):
We’re celebrating this milestone by highlighting some of NSF’s most transformative accomplishments—innovations that have shaped our world and continue to drive progress in health, technology, the environment, and beyond.
Read on 🧵(1/11):
Reposted by Jennifer Francis PhD
I just really need everybody to understand that everything that’s happening in and to the global economy now (and all the businesses and people in it) is the entirely predictable result of the intentional decisions of one guy who doesn’t understand how the global economy works.
May 10, 2025 at 2:53 PM
I just really need everybody to understand that everything that’s happening in and to the global economy now (and all the businesses and people in it) is the entirely predictable result of the intentional decisions of one guy who doesn’t understand how the global economy works.
Truly striking how the Northern Hemisphere dominates this signal. Even locations with few freezing days have seen large declines.
In a new post over at @carbonbrief.org I take a look at how both the coldest 5% of the days in the year (based on daily minimum temperatures) and the number of days below freezing have changed since 1970:
March 14, 2025 at 8:08 PM
Truly striking how the Northern Hemisphere dominates this signal. Even locations with few freezing days have seen large declines.
Reposted by Jennifer Francis PhD
Science for the world. And for you. - Woodwell Climate
www.woodwellclimate.org
February 14, 2025 at 11:09 PM
Reposted by Jennifer Francis PhD
A message from our president and CEO, Dr. Max Holmes:
February 14, 2025 at 11:09 PM
A message from our president and CEO, Dr. Max Holmes:
Reposted by Jennifer Francis PhD
Main Topic: More on a Climate Changed Polar Vortex Affecting Extreme Cold via @washingtonpost.com
On The Extreme Temperature Diary FRU- 1/31/2025
guyonclimate.com
+new #climate #weather + rec temp reports via
@extremetemps.bsky.social
@jfrancisclimate.bsky.social @doctorvive.bsky.social
On The Extreme Temperature Diary FRU- 1/31/2025
guyonclimate.com
+new #climate #weather + rec temp reports via
@extremetemps.bsky.social
@jfrancisclimate.bsky.social @doctorvive.bsky.social
January 31, 2025 at 9:01 PM
Main Topic: More on a Climate Changed Polar Vortex Affecting Extreme Cold via @washingtonpost.com
On The Extreme Temperature Diary FRU- 1/31/2025
guyonclimate.com
+new #climate #weather + rec temp reports via
@extremetemps.bsky.social
@jfrancisclimate.bsky.social @doctorvive.bsky.social
On The Extreme Temperature Diary FRU- 1/31/2025
guyonclimate.com
+new #climate #weather + rec temp reports via
@extremetemps.bsky.social
@jfrancisclimate.bsky.social @doctorvive.bsky.social
Reposted by Jennifer Francis PhD
🧊🔥 New paper @natclimchange.bsky.social: After millennia as a carbon deep-freezer for the planet, a third of the Arctic-boreal zone is now a CO2 source to the atmosphere. The int’l research team was led by @annvirkk.bsky.social
⬇️ Learn more:
permafrost.woodwellclimate.org/after-millen...
⬇️ Learn more:
permafrost.woodwellclimate.org/after-millen...
January 21, 2025 at 5:32 PM
🧊🔥 New paper @natclimchange.bsky.social: After millennia as a carbon deep-freezer for the planet, a third of the Arctic-boreal zone is now a CO2 source to the atmosphere. The int’l research team was led by @annvirkk.bsky.social
⬇️ Learn more:
permafrost.woodwellclimate.org/after-millen...
⬇️ Learn more:
permafrost.woodwellclimate.org/after-millen...
Wildfires? Not so much anymore. At least not in the sense they’re natural. The fingerprints of human-caused climate change are all over them. Maybe firestorms is a more accurate term.
January 15, 2025 at 5:19 PM
Wildfires? Not so much anymore. At least not in the sense they’re natural. The fingerprints of human-caused climate change are all over them. Maybe firestorms is a more accurate term.
The fire, flood, hurricane, heat wave, drought, storm surge, or weather whiplash may not have disrupted your community yet, but we’re all paying handsomely for the climate crisis.
Thanks to climate change, we're barreling towards an insurance crisis, as I wrote for @climateconnections.bsky.social today. It's not just California and Florida – nobody's insurance rates are safe 🧵(1/13)
Nobody’s insurance rates are safe from climate change » Yale Climate Connections
Even if you haven’t suffered direct damage, you’re paying for increasingly extreme weather.
yaleclimateconnections.org
January 15, 2025 at 3:36 AM
The fire, flood, hurricane, heat wave, drought, storm surge, or weather whiplash may not have disrupted your community yet, but we’re all paying handsomely for the climate crisis.
Reposted by Jennifer Francis PhD
“To say CA has always had wildfires is a classic form of climate denial. For years we've heard, ‘The climate has always changed...' that’s just totally disingenuous. The question is whether climate change is making those things worse. The answer is yes."
www.yahoo.com/news/yes-wil...
www.yahoo.com/news/yes-wil...
Yes, wildfires have always happened in California, but climate change is making them worse
As the narrative of the Southern California wildfires has shifted to identifying the causes behind what could prove to be the most expensive natural disaster in U.S. history, a common refrain has emer...
www.yahoo.com
January 14, 2025 at 11:36 PM
“To say CA has always had wildfires is a classic form of climate denial. For years we've heard, ‘The climate has always changed...' that’s just totally disingenuous. The question is whether climate change is making those things worse. The answer is yes."
www.yahoo.com/news/yes-wil...
www.yahoo.com/news/yes-wil...
Evidence is mounting that rapid Arctic warming and melting is contributing to worsening fires in western states. For starters:
www.nature.com/articles/s41...
www.mdpi.com/1999-4907/8/...
pmc.ncbi.nlm.nih.gov/articles/PMC...
www.nature.com/articles/s41...
www.mdpi.com/1999-4907/8/...
pmc.ncbi.nlm.nih.gov/articles/PMC...
January 13, 2025 at 3:25 AM
Evidence is mounting that rapid Arctic warming and melting is contributing to worsening fires in western states. For starters:
www.nature.com/articles/s41...
www.mdpi.com/1999-4907/8/...
pmc.ncbi.nlm.nih.gov/articles/PMC...
www.nature.com/articles/s41...
www.mdpi.com/1999-4907/8/...
pmc.ncbi.nlm.nih.gov/articles/PMC...
Reposted by Jennifer Francis PhD
Any continued #climate denial by politicians or pundits or corporations or self-serving billionaires is no longer just embarrassing, ignorant, or corrupt. It's now increasingly criminal.
January 11, 2025 at 6:21 AM
Any continued #climate denial by politicians or pundits or corporations or self-serving billionaires is no longer just embarrassing, ignorant, or corrupt. It's now increasingly criminal.
Reposted by Jennifer Francis PhD
“We sound like a broken record but only because the records keep breaking,” said Gavin Schmidt, director of the NASA Goddard Institute for Space Studies, which monitors global temperatures. “They will continue to break until we get emissions under control.” www.nytimes.com/2025/01/10/c...
The California Wildfires Are the Latest Disaster Supercharged by Climate Change
Extreme weather events — deadly heat waves, floods, fires and hurricanes — are the consequences of a warming planet, scientists say.
www.nytimes.com
January 11, 2025 at 3:10 AM
“We sound like a broken record but only because the records keep breaking,” said Gavin Schmidt, director of the NASA Goddard Institute for Space Studies, which monitors global temperatures. “They will continue to break until we get emissions under control.” www.nytimes.com/2025/01/10/c...
Reposted by Jennifer Francis PhD
If you think slowing or stopping #climate change is too expensive, you have it backwards.
Failing to slow or stop #climatechange is what's expensive.
www.bbc.com/news/article...
Failing to slow or stop #climatechange is what's expensive.
www.bbc.com/news/article...
LA wildfire damages set to cost record $135bn
Some of the most expensive properties in the US have been wiped out by the fires.
www.bbc.com
January 11, 2025 at 6:34 AM
If you think slowing or stopping #climate change is too expensive, you have it backwards.
Failing to slow or stop #climatechange is what's expensive.
www.bbc.com/news/article...
Failing to slow or stop #climatechange is what's expensive.
www.bbc.com/news/article...
Reposted by Jennifer Francis PhD
A reminder that Los Angeles had its hottest summer in history last year. Southern California has received just 2% of "normal" rainfall during the current "rainy" season.
These fires are a direct result of a warming & drying atmosphere caused by burning fossil fuels.
We are in a climate emergency.
These fires are a direct result of a warming & drying atmosphere caused by burning fossil fuels.
We are in a climate emergency.
January 8, 2025 at 6:08 PM
A reminder that Los Angeles had its hottest summer in history last year. Southern California has received just 2% of "normal" rainfall during the current "rainy" season.
These fires are a direct result of a warming & drying atmosphere caused by burning fossil fuels.
We are in a climate emergency.
These fires are a direct result of a warming & drying atmosphere caused by burning fossil fuels.
We are in a climate emergency.
Yep, our Earth is warming at the hand of humans (it would be cooling if we weren’t here), but frigid spells are still a thing:
x.com/bostonglobe/...
x.com/bostonglobe/...
x.com
x.com
January 8, 2025 at 6:22 PM
Yep, our Earth is warming at the hand of humans (it would be cooling if we weren’t here), but frigid spells are still a thing:
x.com/bostonglobe/...
x.com/bostonglobe/...
Reposted by Jennifer Francis PhD
The puppet master and his puppet.
December 19, 2024 at 8:46 PM
The puppet master and his puppet.
Reposted by Jennifer Francis PhD
Thank you, Inflation Reduction Act!
www.eenews.net/articles/ris...
www.eenews.net/articles/ris...
Rising US solar panel production can nearly meet domestic demand
A drastic increase in manufacturing capacity puts the country on track to produce enough solar modules for American projects.
www.eenews.net
December 14, 2024 at 6:32 PM
Thank you, Inflation Reduction Act!
www.eenews.net/articles/ris...
www.eenews.net/articles/ris...
Reposted by Jennifer Francis PhD
Sadly, it’s a good time to once again share this amazing infographic that we ran at @science.org more than 7 years ago
🧪 #IDsky
www.science.org/content/arti...
🧪 #IDsky
www.science.org/content/arti...
Here's the visual proof of why vaccines do more good than harm
See year by year how vaccines beat back nine dangerous infectious diseases
www.science.org
December 14, 2024 at 9:10 PM
Sadly, it’s a good time to once again share this amazing infographic that we ran at @science.org more than 7 years ago
🧪 #IDsky
www.science.org/content/arti...
🧪 #IDsky
www.science.org/content/arti...
Reposted by Jennifer Francis PhD
Here’s more on why I oppose using taxpayer funds to deploy DAC technology.
drawdown.org/insights/sto...
drawdown.org/insights/sto...
Stop giving Big Oil a carbon fig leaf
The Biden Administration is backing industrial carbon capture schemes that overwhelmingly benefit Big Oil – bolstering their bottom lines and extending a PR lifeline that ensures they can continue pol...
drawdown.org
December 13, 2024 at 5:45 PM
Here’s more on why I oppose using taxpayer funds to deploy DAC technology.
drawdown.org/insights/sto...
drawdown.org/insights/sto...
Reposted by Jennifer Francis PhD
THIS is how it’s done, folks.
December 14, 2024 at 1:49 PM
THIS is how it’s done, folks.
Reposted by Jennifer Francis PhD
I think Direct Air Capture (DAC) is nowhere near ready to deploy. It’s too expensive, faces huge engineering challenges, and diverts money and attention from better climate solutions.
Let’s stop giving fossil fuels a fig leaf on the taxpayer’s dime.
news.mongabay.com/2024/12/dire...
Let’s stop giving fossil fuels a fig leaf on the taxpayer’s dime.
news.mongabay.com/2024/12/dire...
Direct air capture climate solution faces harsh criticism, steep challenges
Pulling carbon dioxide directly from the air with giant vacuum-like devices is an enticing solution to the climate crisis, with governments and industry funneling billions of dollars into direct air c...
news.mongabay.com
December 13, 2024 at 5:36 PM
I think Direct Air Capture (DAC) is nowhere near ready to deploy. It’s too expensive, faces huge engineering challenges, and diverts money and attention from better climate solutions.
Let’s stop giving fossil fuels a fig leaf on the taxpayer’s dime.
news.mongabay.com/2024/12/dire...
Let’s stop giving fossil fuels a fig leaf on the taxpayer’s dime.
news.mongabay.com/2024/12/dire...