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Sean Fox

@seanurban.bsky.social
527 followers 379 following 32 posts

Cities, global development, political economy, science & miscellanea. Currently writing a book on *How we became an urban species* All papers freely available here: sites.google.com/view/drseanfox/home

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Reposted by Sean Fox
+Lab @ University of Bristol @pluslab.bsky.social · 23/07/2026
Why do cities exist at all? Luis Bettencourt sees that as a fundamental unresolved question in urban science, and one from which all others may follow.
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+Lab @ University of Bristol @pluslab.bsky.social · 20/07/2026
"We don’t know if this is a good idea. We don’t know if this is necessary. We don’t know what the costs are of trying to impose such a limit." Lewis Dijkstra notes that many major policies treat urban sprawl as inherently bad.
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+Lab @ University of Bristol @pluslab.bsky.social · 21/07/2026
"We know more about rivers in the Arctic than we do about urban rivers" That's the unresolved problem posed by Josh Dean in this lightning talk. Cities are shaped and used by people daily, yet we understand their ecological systems far less than remote wilderness.
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+Lab @ University of Bristol @pluslab.bsky.social · 09/07/2026
And now for a fiendish (unresolved) question from @martinfleischmann.net: "What is a building?" Sometimes questions with apparently obvious answers are very confusing on closer inspection!
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+Lab @ University of Bristol @pluslab.bsky.social · 09/07/2026
In this lightning talk, Somwrita Sarkar asks one of the most important (and unresolved) questions in urban science: "When do 'good' inequalities turn into 'bad' inequalities?" See Somwrita's full lightning talk at youtu.be/GFOOTqpbMEw pluslab.bristol.ac.uk/launch-sympo... #urbanscience #inequality
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Reposted by Sean Fox
+Lab @ University of Bristol @pluslab.bsky.social · 08/07/2026
Find out more about the +Lab launch symposium in our short overview video. Short talks from the event being added daily here: pluslab.bristol.ac.uk/launch-sympo... @bristoluni.bsky.social
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+Lab @ University of Bristol @pluslab.bsky.social · 13/07/2026
"Who is likely to live where?" In this lightning talk, Felix Agyemang proposes that – despite decades of progress in urban land-use modelling – predicting where development happens, and who ends up living there, remains a key unresolved problem in urban science.
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+Lab @ University of Bristol @pluslab.bsky.social · 13/07/2026
Steam 🚂 Jet engines ✈️ Air conditioning ❄️ Teleconferencing 🖥️ Now AI. Emmanouil Tranos unpacks the feedback loop between new technologies and cities — tech is born in cities, then reshapes what cities are and do.
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+Lab @ University of Bristol @pluslab.bsky.social · 13/07/2026
So where does AI take us? Driverless cars? Wealth redistribution? Cities will have to react - but slowly given the sunk cost locked into buildings and infrastructure. See Emmanouil's full lightning talk at youtu.be/0GGdmlviLno?... pluslab.bristol.ac.uk/launch-sympo... #UrbanScience #Cities
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Reposted by Sean Fox
+Lab @ University of Bristol @pluslab.bsky.social · 09/07/2026
“You will be more influential than Jane Jacobs. More than Patrick Geddes. Not because you're smarter — because more people are living urban lives today than ever before, and the ideas we act on now will shape more of them than any generation's have.”
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+Lab @ University of Bristol @pluslab.bsky.social · 10/07/2026
More data won't save urban planning. In this lightning talk, @geoffboeing.com argues that the field's toughest problems — congestion, air pollution, and beyond — aren't just technical puzzles waiting for one more coefficient.
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+Lab @ University of Bristol @pluslab.bsky.social · 08/07/2026
What is urban? Director @seanurban.bsky.social's opening talk from our symposium on "unsolved problems in urban science". More short talks from the event being added daily here: pluslab.bristol.ac.uk/launch-sympo...
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+Lab @ University of Bristol @pluslab.bsky.social · 07/07/2026
📽️ 🎬 🎞️ The first videos from the +Lab launch symposium on "Unsolved problems in urban science" are now available! First, a short overview explaining why we organised the symposium and what we want it to achieve. pluslab.bristol.ac.uk/launch-sympo... ⚡Individual lightning talks to follow soon...
View of lecture theatre during +Lab opening session
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Arndt Leininger @aleininger.bsky.social · 30/04/2026
📢 We're hiring for my project RESPOL on residential mobility & electoral realignment 📍 University of Hamburg 📅 4y, 75% FTE 🔍 pol behavior, comp politics, regional inequalities 📊 quant, administrative & survey data Please share with talented MA students! 🔗 www.uni-hamburg.de/en/stellenan...
uni-hamburg.de
Job advertisement
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Reposted by Sean Fox
Andrew Carter @andrewcities.bsky.social · 18/04/2026
What is a city without children? giftarticle.ft.com/giftarticle/...
giftarticle.ft.com
What is a city without children?
As urban housebuilding strategies around the world increasingly push families out, the ‘sidewalk ballet’ — and heart — of community life is under threat
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Cameron Blevins @cblevins.bsky.social · 03/04/2026
This is so, so well-articulated.
People call this friction "grunt work." Schwartz uses exactly that phrase, and he's right that LLMs can remove it. What he doesn't say, because he already has decades of hard-won intuition and doesn't need the grunt work anymore, is that for someone who doesn't yet have that intuition, the grunt work is the work. The boring parts and the important parts are tangled together in a way that you can't separate in advance. You don't know which afternoon of debugging was the one that taught you something fundamental about your data until three years later, when you're working on a completely different problem and the insight surfaces. Serendipity doesn't come from efficiency. It comes from spending time in the space where the problem lives, getting your hands dirty, making mistakes that nobody asked you to make and learning things nobody assigned you to learn.
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David Zipper @davidzipper.bsky.social · 26/03/2026
Manhattan's congestion pricing program has been a stunning success. Other US cities have noticed. Could Chicago go next? In @bloomberg.com, I explored. 🧵
bloomberg.com
Could Congestion Pricing Pay Off for Chicago?
Second City leaders have discussed following Manhattan’s lead in tolling roads to ease traffic. But a Chicago-style version of New York’s policy might look very different.
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Peter Walker @peterwalker99.bsky.social · 25/03/2026
NEW: Councils in England are for the first time to receive guidance on how to create streets that are safer for women and girls, as ministers try to tackle what they describe as systemic unfairness in people’s ability to walk around their own neighbourhood. www.theguardian.com/politics/202...
theguardian.com
English councils to get guidance on designing safer streets for women and girls
Local transport minister describes initiative as fundamental issue of fairness in people’s ability to walk in their neighbourhoods
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Geoff Boeing @geoffboeing.com · 24/03/2026
Marc Barthelemy and I recently published an article in Physical Review Letters titled "Universal Model of Urban Street Networks." We present an algorithm to generate urban street networks that reproduce key empirical characteristics. Paper link: doi.org/10.1103/1vj4... Here's a short summary...
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Sean Fox @seanurban.bsky.social · 24/03/2026
🚨 We’re Hiring! 🚨 We're recruiting a Lecturer in Sustainable Urban Development. 3-year post in the School of Geographical Sciences @bristoluni.bsky.social #cities #sustainability #sustainabledevelopment 👉 Here’s the job advert: www.bristol.ac.uk/jobs/find/de...
bristol.ac.uk
Details | Working at Bristol | University of Bristol
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Carl Müller-Crepon @carlmc.bsky.social · 20/03/2026
I'm very excited that you all can now read about Itinerant Rule in the Holy Roman Empire from 919-1519 in the @ajpseditor.bsky.social! Thank you @claranw.bsky.social, @andrejkokkonen.bsky.social and Jørgen Møller for a great collaboration! onlinelibrary.wiley.com/doi/10.1111/...
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Prof Lisa Schipper 🌍🍉💪 @lisaschipper.bsky.social · 20/03/2026
Have you heard of paper mills? If you are an academic and especially if you are a journal editor, you will know what this is. Even so, this video was really eye-opening. www.youtube.com/watch?v=SEwi...
youtube.com
I tried to buy a scientific paper
YouTube video by Christophe
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Sharon O'Dea @sharonodea.com · 26/02/2026
Quite rare to see a chart that says quite so overtly that no one involved has the slightest clue what’s happening here
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Sean Fox @seanurban.bsky.social · 25/02/2026
Get a bike! www.scientificamerican.com/article/a-hu...
scientificamerican.com
The Most Efficient Traveler Isn’t a Bird or a Fish—It’s You on a Bike
A famous graphic, now updated, compares locomotion in the animal kingdom
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Sean Fox @seanurban.bsky.social · 25/02/2026
Net zero will transform Britain’s economy – our map reveals the most vulnerable places theconversation.com/net-zero-wil...
theconversation.com
Net zero will transform Britain’s economy – our map reveals the most vulnerable places
The most vulnerable places are, overwhelmingly, the same places that suffered industrial decline in the 1980s.
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David Zipper @davidzipper.bsky.social · 22/01/2026
A surefire way to make transportation more abundant and affordable? Increase density. In Bloomberg, I explained why. 🧵
bloomberg.com
Achieving ‘Transportation Abundance’ Is All About Density
To drive down transportation costs and move the needle on affordability, Americans need to embrace living closer together.
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The Quarterly Journal of Economics @qjeharvard.bsky.social · 16/10/2025
Recently accepted by #QJE, “The Price of Housing in the United States, 1890–2006,” by Lyons (@ronanlyons), Shertzer (@econhist-allday), Gray (@econhistoryorbust), and Agorastos: doi.org/10.1093/qje/...
doi.org
The Price of Housing in the United States, 1890–2006*
Abstract. We construct the first annual market rent and home sales price series for American cities over the 20th century using 2.7 million newspaper real
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Michael Li (李之樸) @mcpli.bsky.social · 31/12/2025
The final Calvin and Hobbes, which appeared in papers 30 years ago today.
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Gabriel Zucman @gabrielzucman.bsky.social · 12/12/2025
It has become received wisdom in Brussels and Washington that there is a new “euro-sclerosis”: that the EU economy is lagging the US This view is wrong A little primer on the measurement of productivity – and why reports of the economic death of Europe are greatly exaggerated🧵
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Brent Toderian @brenttoderian.bsky.social · 11/12/2025
“Air pollution fell substantially as Paris restricted car traffic and made way for parks, people-streets and bike-lanes.” Better for the climate, better for health, better for livability and quality of life. Common sense. Such a no-brainer, it’s remarkable that more cities HAVEN’T done the same.
washingtonpost.com
Paris said au revoir to cars. Air pollution maps reveal a dramatic change.
Air pollution fell substantially as the city restricted car traffic and made way for parks and bike lanes.
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Brent Toderian @brenttoderian.bsky.social · 09/12/2025
Never forget, car dependency isn’t freedom. Some might ask “what’s more free than cars?” Choices. Choices are more free than car dependency. It’s not a hard concept. I’m not pitting cars against any other single mode of transport. I’m rejecting design that creates dependency on just one mode.
Complex highway interchange from the air
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Jarrett Walker @humantransit.bsky.social · 02/12/2025
Is your transit agency "succeeding"? It depends on the definition of success, and not everyone agrees on that. Here's my timeless article on this, just now updated a bit. humantransit.org/2018/02/basi...
humantransit.org
Basics: The Ridership - Coverage Tradeoff — Human Transit
Is your transit agency succeeding?  It depends on what it’s trying to do, and most transit agencies haven’t been given clear direction about what they should be trying to do.  Different people have di...
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Sean Fox @seanurban.bsky.social · 17/11/2025
Interesting chart on the fall and rise of Asia in the global economy (and the rise and fall of the "West") courtesy of @data.ft.com
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Scott Lincicome @scottlincicome.bsky.social · 10/11/2025
New @nberpubs: "The Economic Impact of Brexit" www.nber.org/papers/w34459 "by 2025, Brexit had reduced UK GDP by 6% to 8%, with the impact accumulating gradually over time." 😲
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Sean Fox @seanurban.bsky.social · 08/11/2025
This is very cool research on how the built environment may affect political behaviour
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Carla Denyer @carladenyer.bsky.social · 09/10/2025
Govt promised to help Palestinians get to UK to study- but I'm in touch with 7 young Palestinians with scholarships at @bristoluni.bsky.social who are trapped in Gaza because the Home Office isn't doing what was promised Shocking neglect putting lives at risk www.aljazeera.com/opinions/202...
aljazeera.com
Accepted but trapped: Why won’t the UK evacuate its students from Gaza?
Palestinian students in Gaza who earned places at top UK universities are being stranded by political indifference.
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Dr Jessica Hagen-Zanker @j-hagen-zanker.bsky.social · 26/09/2025
It’s party conference season – and bombastic statements on immigration are at the top of playlists. I for one am tired of hearing the same old emotionally charged promises that just don’t relate to reality. You too? Here are five things you should be hearing about immigration, but won’t be.
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Sean Fox @seanurban.bsky.social · 19/09/2025
🌍📢 Call for Papers!! Urban Studies seeks submissions for a special issue on Climate Urbanism, Resilience & Justice — exploring how cities confront the climate crisis, risk, & inequality. @urbanstudiesjournal.com @acuto.bsky.social  www.urbanstudiesjournal.com/callforpaper...
urbanstudiesjournal.com
Climate Urbanism, Resilience, and Justice - Urban Studies
Urban Studies Journal Call for Papers is now open: Climate Urbanism, Resilience and Justice. Submission deadline: 31 January 2026.
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Claus Pörtner @clausportner.bsky.social · 19/08/2025
New in Demography: ‘How Is Fertility Behavior in Africa Different?’ Using DHS/MICS data, SSA–other-region fertility gaps rise through primary school and narrow at higher schooling; little difference among women with secondary+. doi.org/10.1215/0070... @readdemography.bsky.social @seattleu.edu
doi.org
How Is Fertility Behavior in Africa Different? | Demography | Duke University Press
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Sean Fox @seanurban.bsky.social · 27/08/2025
Really enjoyed taking part in this conversation with Divya Gupta & Gregory Randolph on #urbanization and #inequality in India on the In Common Podcast: www.incommonpodcast.org/podcast/136-...
incommonpodcast.org
136: Urbanization and Inequality with Sean Fox and Gregory Randolph
In this episode, Divya speaks with Sean Fox and Gregory Randolph about urbanization and how it is unfolding amid global shocks and affecting inequality. Sean Fox is a Professor of Geography and Globa
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Andrew Carter @andrewcities.bsky.social · 27/05/2025
Deadline is June 1st (23.59).
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Rebecca Sear @rebeccasear.bsky.social · 22/05/2025
"oral contraceptives may be lowering all-cause mortality in women: either through the modification of mortality risk at all ages or, possibly, by modifying aging rates and mortality rate doubling times through the synthetic modification of adaptive pathways" www.nature.com/articles/s44...
nature.com
Reproductive milestones and oral contraceptive timing predict late-life mortality - npj Women's Health
npj Women's Health - Reproductive milestones and oral contraceptive timing predict late-life mortality
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Brent Toderian @brenttoderian.bsky.social · 29/04/2025
This is interesting — a recent study of mode share (the % share of transportation trips by car, transit, walking, biking etc) relative to city size and income levels in almost 800 cities in 61 countries. Interesting results. HT @davidzipper.bsky.social www.sciencedirect.com/science/arti...
Graphic showing where various cities are placed relative to whether everyone walks their cycles, everyone uses public transit, or everyone drives.
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Centre for Cities @centreforcities.bsky.social · 29/04/2025
BRIEFING | The myth of “left behind” ❓How should government respond to the political discontent signalled by the vote to leave the European Union and the more recent rise of Reform UK? buff.ly/g8K7EDQ 👇
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Nuno Palma @nunopgpalma.bsky.social · 07/04/2025
𝗦𝘁𝗮𝘁𝗲 𝗰𝗮𝗽𝗮𝗰𝗶𝘁𝘆 𝗮𝗻𝗱 𝗲𝘅𝗲𝗰𝘂𝘁𝗶𝘃𝗲 𝗰𝗼𝗻𝘀𝘁𝗿𝗮𝗶𝗻𝘁𝘀 𝗶𝗻 𝗲𝗮𝗿𝗹𝘆 𝗺𝗼𝗱𝗲𝗿𝗻 𝗘𝘂𝗿𝗼𝗽𝗲 New paper by K. Karaman, A. Henriques, & myself. Contrary to conventional wisdom we find that constrained government & state capacity were not systematically related. England stood out for combining both which helps explain its take-off
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Catrin Einhorn @catrineinhorn.bsky.social · 27/03/2025
From state legislatures to community groups, from tribal lands to city parks to postage-stamp backyards, people are doing quiet, vital work to confront climate change and biodiversity loss. All year, @carabuckley.bsky.social and I will be writing about these efforts. www.nytimes.com/interactive/...
nytimes.com
50 States, 50 Fixes
A series about local solutions, and the people behind them, to environmental problems.
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ESRC Centre for Population Change and Connecting Generations @cpc-cg.bsky.social · 27/03/2025
Andy Tatem & Jessica Espey @worldpop-uos.bsky.social report on the growing global crisis in #population data in @theconversation.com. Please share across your networks 📨 "When people vanish from data, they vanish from policy... causing political underrepresentation & inadequate resource allocation"
theconversation.com
Global population data is in crisis – here’s why that matters
When certain groups of people are systematically undercounted, they become invisible to policymakers.
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NBER @nber.org · 27/03/2025
Sewer access shapes developing world cities. New research shows effects on population density as large as for highways, but little on demographics, from Sean E. McCulloch, Matthew P. Schaelling, Matthew Turner, and Toru Kitagawa www.nber.org/papers/w33597
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Rebecca Sear @rebeccasear.bsky.social · 25/03/2025
Nice article on population projections, making the point that one problem with population panics is that it’s incredibly difficult to predict population trends. Implementing drastic policy solutions on the basis of long-term population projections is therefore not a good idea
vox.com
The mysterious statisticians shaping how we think about fertility
Experts were wrong about overpopulation before. Could they be wrong about underpopulation now?
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Brent Toderian @brenttoderian.bsky.social · 23/03/2025
My semi-regular reminder of a really important reality about cities, density, services and taxes. Any questions? Graphic recently cleaned up by @kathrynmathias.bsky.social. #CityMakingMath
Venn diagram of low taxes, low density and stable services. The overlap in the centre is a scenario that doesn’t exist
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