Hannah Ritchie
@hannahritchie.bsky.social
Deputy Editor, Our World in Data
Senior Researcher, University of Oxford
Climate, energy, environment, all things data.
Senior Researcher, University of Oxford
Climate, energy, environment, all things data.
If you’re looking for some holiday reading, my new book — Clearing the Air — is on offer at £1.99 on Kindle for the next 24 hours.
Hope you enjoy!
www.amazon.co.uk/Clearing-Air...
Hope you enjoy!
www.amazon.co.uk/Clearing-Air...
December 22, 2025 at 6:22 AM
If you’re looking for some holiday reading, my new book — Clearing the Air — is on offer at £1.99 on Kindle for the next 24 hours.
Hope you enjoy!
www.amazon.co.uk/Clearing-Air...
Hope you enjoy!
www.amazon.co.uk/Clearing-Air...
Reposted by Hannah Ritchie
December 9, 2025 at 10:51 AM
The Warming Stripes have been an iconic way to communicate temperature data. On the latest episode of the podcast, we got to speak to their creator, @edhawkins.org.
As a fellow data viz nerd, this was a fun one.
The latest episode of our podcast:
podcasts.apple.com/gb/podcast/p...
As a fellow data viz nerd, this was a fun one.
The latest episode of our podcast:
podcasts.apple.com/gb/podcast/p...
December 9, 2025 at 8:29 AM
The Warming Stripes have been an iconic way to communicate temperature data. On the latest episode of the podcast, we got to speak to their creator, @edhawkins.org.
As a fellow data viz nerd, this was a fun one.
The latest episode of our podcast:
podcasts.apple.com/gb/podcast/p...
As a fellow data viz nerd, this was a fun one.
The latest episode of our podcast:
podcasts.apple.com/gb/podcast/p...
What happened on energy and climate in China this year?
A summary of the data, mostly drawing on the latest report from Centre for Research on Energy and Clean Air (by @laurimyllyvirta.bsky.social & team).
My latest Substack:
www.sustainabilitybynumbers.com/p/chinese-em...
A summary of the data, mostly drawing on the latest report from Centre for Research on Energy and Clean Air (by @laurimyllyvirta.bsky.social & team).
My latest Substack:
www.sustainabilitybynumbers.com/p/chinese-em...
What happened on energy and climate in China this year?
Emissions flatlined; clean power pushed out coal; and oil for transport falls again.
www.sustainabilitybynumbers.com
December 5, 2025 at 1:52 PM
What happened on energy and climate in China this year?
A summary of the data, mostly drawing on the latest report from Centre for Research on Energy and Clean Air (by @laurimyllyvirta.bsky.social & team).
My latest Substack:
www.sustainabilitybynumbers.com/p/chinese-em...
A summary of the data, mostly drawing on the latest report from Centre for Research on Energy and Clean Air (by @laurimyllyvirta.bsky.social & team).
My latest Substack:
www.sustainabilitybynumbers.com/p/chinese-em...
Reposted by Hannah Ritchie
As of today, there are more electric cars than diesel cars in Norway.
Flere elbiler enn dieselbiler i Norge
3. desember er en merkedag i norsk bilhistorie: Nå er elbil den mest vanlige personbil-typen på veiene i Norge.
elbil.no
December 3, 2025 at 6:55 PM
As of today, there are more electric cars than diesel cars in Norway.
When people see me working with headphones on, they probably assume I'm listening to calming classical or focus music.
In reality, I'm blaring rap and grime.
In reality, I'm blaring rap and grime.
December 3, 2025 at 4:37 PM
When people see me working with headphones on, they probably assume I'm listening to calming classical or focus music.
In reality, I'm blaring rap and grime.
In reality, I'm blaring rap and grime.
Just discovered that Spotify does a "Wrapped for Authors" on their audiobook demographics for the year.
Fun!
In my experience, climate/energy stuff is usually quite male-skewed, but I was pleasantly surprised to see that my book listeners weren't skewed *that* much!
Fun!
In my experience, climate/energy stuff is usually quite male-skewed, but I was pleasantly surprised to see that my book listeners weren't skewed *that* much!
December 3, 2025 at 4:18 PM
Just discovered that Spotify does a "Wrapped for Authors" on their audiobook demographics for the year.
Fun!
In my experience, climate/energy stuff is usually quite male-skewed, but I was pleasantly surprised to see that my book listeners weren't skewed *that* much!
Fun!
In my experience, climate/energy stuff is usually quite male-skewed, but I was pleasantly surprised to see that my book listeners weren't skewed *that* much!
Reposted by Hannah Ritchie
This is a legitimate scientific revolution in meteorology.
Also, to be clear, these models are not the AI LLMs that most people are familiar with. They are machine learning algorithms trained on observations (actually reanalysis).
Also, to be clear, these models are not the AI LLMs that most people are familiar with. They are machine learning algorithms trained on observations (actually reanalysis).
Meteorologists are surprised that the weather model that did the best job forecasting hurricanes this year was a new one, introduced by Google. AI may be the beginning of a new era of forecasting. n.pr/49MFa1M
As the 2025 Atlantic hurricane season ends, the future of forecasting is AI
Meteorologists are surprised that the weather model that did the best job forecasting hurricanes this year was a new one, introduced by Google. AI may be the beginning of a new era of forecasting.
n.pr
November 30, 2025 at 5:55 AM
This is a legitimate scientific revolution in meteorology.
Also, to be clear, these models are not the AI LLMs that most people are familiar with. They are machine learning algorithms trained on observations (actually reanalysis).
Also, to be clear, these models are not the AI LLMs that most people are familiar with. They are machine learning algorithms trained on observations (actually reanalysis).
Reposted by Hannah Ritchie
The Nepalese EV transition.
In simple terms, brown on this graph is India's share and blue is China's share.
The trigger? India effectively halted all imports of petroleum into Nepal in 2015, an "undeclared blockade", which was "masked as constitutional concern".
robbieandrew.github.io/carsales/
In simple terms, brown on this graph is India's share and blue is China's share.
The trigger? India effectively halted all imports of petroleum into Nepal in 2015, an "undeclared blockade", which was "masked as constitutional concern".
robbieandrew.github.io/carsales/
November 25, 2025 at 1:53 PM
The Nepalese EV transition.
In simple terms, brown on this graph is India's share and blue is China's share.
The trigger? India effectively halted all imports of petroleum into Nepal in 2015, an "undeclared blockade", which was "masked as constitutional concern".
robbieandrew.github.io/carsales/
In simple terms, brown on this graph is India's share and blue is China's share.
The trigger? India effectively halted all imports of petroleum into Nepal in 2015, an "undeclared blockade", which was "masked as constitutional concern".
robbieandrew.github.io/carsales/
Reposted by Hannah Ritchie
In the last decades, the world has made fantastic progress against extreme poverty. In 1990, 2.3 billion people lived in extreme poverty. Since then, the number of extremely poor people has declined by 1.5 *billion* people. 🧵
November 17, 2025 at 11:24 AM
In the last decades, the world has made fantastic progress against extreme poverty. In 1990, 2.3 billion people lived in extreme poverty. Since then, the number of extremely poor people has declined by 1.5 *billion* people. 🧵
Good thread from Dave about the new IEA "Current Policies Scenario" making a lot of the headlines.
Here is a very quick mock-up I made of what this scenario assumes for solar PV additions through to 2035, with historical context.
I'll let you decide whether this seems likely.
Here is a very quick mock-up I made of what this scenario assumes for solar PV additions through to 2035, with historical context.
I'll let you decide whether this seems likely.
November 12, 2025 at 3:05 PM
Good thread from Dave about the new IEA "Current Policies Scenario" making a lot of the headlines.
Here is a very quick mock-up I made of what this scenario assumes for solar PV additions through to 2035, with historical context.
I'll let you decide whether this seems likely.
Here is a very quick mock-up I made of what this scenario assumes for solar PV additions through to 2035, with historical context.
I'll let you decide whether this seems likely.
RIP Quentin Wilson. A great communicator and advocate for electrified transport.
His calm way of calling out misinformation and trying to cross the divide will be sorely missed.
A nice tribute video from: @bobbyllew.bsky.social
youtu.be/NlTalT3faSM?...
His calm way of calling out misinformation and trying to cross the divide will be sorely missed.
A nice tribute video from: @bobbyllew.bsky.social
youtu.be/NlTalT3faSM?...
'Top Tier': Robert & Dan pay tribute to Quentin Willson. Gone too soon, never forgotten.
YouTube video by Everything Electric CARS
youtu.be
November 11, 2025 at 10:01 AM
RIP Quentin Wilson. A great communicator and advocate for electrified transport.
His calm way of calling out misinformation and trying to cross the divide will be sorely missed.
A nice tribute video from: @bobbyllew.bsky.social
youtu.be/NlTalT3faSM?...
His calm way of calling out misinformation and trying to cross the divide will be sorely missed.
A nice tribute video from: @bobbyllew.bsky.social
youtu.be/NlTalT3faSM?...
Reposted by Hannah Ritchie
China's new climate targets made it clear that policymakers are still leaving the door open to a rebound in emissions in the next few years, despite a recent falling trend and clean energy growth rates that will keep emissions falling if sustained.
🇨🇳 NEW | Experts think #China can exceed its new 2035 #NDCs, but are less certain about short-term #emissions cuts
Full China Climate Transition Outlook 2025 survey:
energyandcleanair.org/publication/chinas-climate-transition-outlook-2025-expert-survey/
w/ @belindaschaepe.bsky.social; Xunpeng Shi
Full China Climate Transition Outlook 2025 survey:
energyandcleanair.org/publication/chinas-climate-transition-outlook-2025-expert-survey/
w/ @belindaschaepe.bsky.social; Xunpeng Shi
November 6, 2025 at 5:10 AM
China's new climate targets made it clear that policymakers are still leaving the door open to a rebound in emissions in the next few years, despite a recent falling trend and clean energy growth rates that will keep emissions falling if sustained.
In a new Gallup poll in the US, 12.4% of adults said that they'd taken GLP-1 drugs for weight loss.
15% in women, and 9% in men.
I'd have guessed half as much, but I guess I'm a year behind the times.
news.gallup.com/poll/696599/...
15% in women, and 9% in men.
I'd have guessed half as much, but I guess I'm a year behind the times.
news.gallup.com/poll/696599/...
October 30, 2025 at 6:02 PM
In a new Gallup poll in the US, 12.4% of adults said that they'd taken GLP-1 drugs for weight loss.
15% in women, and 9% in men.
I'd have guessed half as much, but I guess I'm a year behind the times.
news.gallup.com/poll/696599/...
15% in women, and 9% in men.
I'd have guessed half as much, but I guess I'm a year behind the times.
news.gallup.com/poll/696599/...
Reposted by Hannah Ritchie
The ensemble mean of Google DeepMind's experimental machine learning weather model had Hurricane Melissa hitting Jamaica 7 days out. That's very impressive.
October 28, 2025 at 10:52 AM
The ensemble mean of Google DeepMind's experimental machine learning weather model had Hurricane Melissa hitting Jamaica 7 days out. That's very impressive.
One area where AI has a lot of potential is in weather forecasting and climate modelling.
Fairly accurate weather forecasting, in particular, is something that many of us now take for granted.
From my latest Substack: www.sustainabilitybynumbers.com/p/artificial...
Fairly accurate weather forecasting, in particular, is something that many of us now take for granted.
From my latest Substack: www.sustainabilitybynumbers.com/p/artificial...
Artificial intelligence could dramatically improve weather forecasting
An AI-based model outperformed every other in forecasting the Indian monsoon this year. This helped millions of farmers.
www.sustainabilitybynumbers.com
October 28, 2025 at 10:34 AM
One area where AI has a lot of potential is in weather forecasting and climate modelling.
Fairly accurate weather forecasting, in particular, is something that many of us now take for granted.
From my latest Substack: www.sustainabilitybynumbers.com/p/artificial...
Fairly accurate weather forecasting, in particular, is something that many of us now take for granted.
From my latest Substack: www.sustainabilitybynumbers.com/p/artificial...
My favourite event of the year 🧵👇
Time for 2025 updates to my annual “opinions about solar” thread. If you like these, you might like the second edition of my book, Solar Power Finance Without The Jargon. A 30% discount code WSQ0437 is valid on publisher website until end of November 2025.
www.worldscientific.com/worldscibook...
www.worldscientific.com/worldscibook...
Solar Power Finance Without the Jargon
www.worldscientific.com
October 20, 2025 at 4:11 PM
My favourite event of the year 🧵👇
Reposted by Hannah Ritchie
Big China electricity&industial data update🧵for September:
➡️Power generation from coal and gas dropped 5%, for a 1.2% fall in the first nine months of the year.
➡️Crude steel production fell by 5% and cement output by 9% in Sep, accelerating from 3% and 5% drops year-to-date.
➡️Power generation from coal and gas dropped 5%, for a 1.2% fall in the first nine months of the year.
➡️Crude steel production fell by 5% and cement output by 9% in Sep, accelerating from 3% and 5% drops year-to-date.
October 20, 2025 at 5:03 AM
Big China electricity&industial data update🧵for September:
➡️Power generation from coal and gas dropped 5%, for a 1.2% fall in the first nine months of the year.
➡️Crude steel production fell by 5% and cement output by 9% in Sep, accelerating from 3% and 5% drops year-to-date.
➡️Power generation from coal and gas dropped 5%, for a 1.2% fall in the first nine months of the year.
➡️Crude steel production fell by 5% and cement output by 9% in Sep, accelerating from 3% and 5% drops year-to-date.
On November 4th I'll be in London at the How To Academy, discussing and answering question about solutions to climate change, and how they stack up.
If you're interested in coming along, you can find details here:
howtoacademy.com/events/how-t...
If you're interested in coming along, you can find details here:
howtoacademy.com/events/how-t...
October 13, 2025 at 4:54 PM
On November 4th I'll be in London at the How To Academy, discussing and answering question about solutions to climate change, and how they stack up.
If you're interested in coming along, you can find details here:
howtoacademy.com/events/how-t...
If you're interested in coming along, you can find details here:
howtoacademy.com/events/how-t...
Reposted by Hannah Ritchie
This article is just bollocks, isn't it? There are lots of good reasons not to eat many Doritos, but the carbon footprint of the corn going into them isn't one of them, because eating almost anything else would be worse.
www.theguardian.com/environment/...
www.theguardian.com/environment/...
The hidden cost of ultra-processed foods on the environment: ‘The whole industry should pay’
Industrially made foods involve several ingredients and processes to put together, making it difficult to examine their true cost
www.theguardian.com
October 8, 2025 at 5:55 PM
This article is just bollocks, isn't it? There are lots of good reasons not to eat many Doritos, but the carbon footprint of the corn going into them isn't one of them, because eating almost anything else would be worse.
www.theguardian.com/environment/...
www.theguardian.com/environment/...
Reposted by Hannah Ritchie
Does the news reflect what we die from?
October 7, 2025 at 4:35 PM
Does the news reflect what we die from?
Reposted by Hannah Ritchie
NEW: GLOBAL RENEWABLES OVERTAKES COAL
How the heck did that happen so quickly?!...🧵
How the heck did that happen so quickly?!...🧵
October 7, 2025 at 6:06 AM
NEW: GLOBAL RENEWABLES OVERTAKES COAL
How the heck did that happen so quickly?!...🧵
How the heck did that happen so quickly?!...🧵
Reposted by Hannah Ritchie
Not nearly enough is made of the incredibly impressive feat Indian Railways has made to electrify almost 100% of its 135,000km of track, while also growing renewable sourcing. Huge:
timesofindia.indiatimes.com/business/ind...
timesofindia.indiatimes.com/business/ind...
Indian Railways to achieve net zero targets in 2025 itself - 5 years ahead of 2030 goal - Times of India
India Business News: Indian Railways is set to achieve net-zero targets by year-end, surpassing its 2030 goal through extensive electrification. Aiming for 95% electric tr
timesofindia.indiatimes.com
October 5, 2025 at 7:25 AM
Not nearly enough is made of the incredibly impressive feat Indian Railways has made to electrify almost 100% of its 135,000km of track, while also growing renewable sourcing. Huge:
timesofindia.indiatimes.com/business/ind...
timesofindia.indiatimes.com/business/ind...
Reposted by Hannah Ritchie
Some good news.
London is meeting legal limits for toxic NO2 pollution for the first time – almost 200 years earlier than predicted – following the Mayor’s "world leading air pollution policies," City Hall announces.
The Ultra Low Emissions Zone - and similar policies - really do work.
London is meeting legal limits for toxic NO2 pollution for the first time – almost 200 years earlier than predicted – following the Mayor’s "world leading air pollution policies," City Hall announces.
The Ultra Low Emissions Zone - and similar policies - really do work.
September 30, 2025 at 7:39 PM
Some good news.
London is meeting legal limits for toxic NO2 pollution for the first time – almost 200 years earlier than predicted – following the Mayor’s "world leading air pollution policies," City Hall announces.
The Ultra Low Emissions Zone - and similar policies - really do work.
London is meeting legal limits for toxic NO2 pollution for the first time – almost 200 years earlier than predicted – following the Mayor’s "world leading air pollution policies," City Hall announces.
The Ultra Low Emissions Zone - and similar policies - really do work.
Reposted by Hannah Ritchie
Foreign aid from the United States saved millions of lives each year by @hannahritchie.bsky.social and @simonvanteutem.bsky.social
ourworldindata.org/us-foreign-a...
ourworldindata.org/us-foreign-a...
Foreign aid from the United States saved millions of lives each year
For decades, these aid programs received bipartisan support and made a difference. Cutting them will cost lives.
ourworldindata.org
September 29, 2025 at 2:59 PM
Foreign aid from the United States saved millions of lives each year by @hannahritchie.bsky.social and @simonvanteutem.bsky.social
ourworldindata.org/us-foreign-a...
ourworldindata.org/us-foreign-a...