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Jeff Colgan

@jeffcolgan.bsky.social

Professor of International Relations and Political Science. Interests: international order, energy, climate change, historical IR

6,575 Followers  |  524 Following  |  459 Posts  |  Joined: 20.08.2023  |  2.0102

Latest posts by jeffcolgan.bsky.social on Bluesky


If the Fall Olympics didn't have axe throwing, it would be a terrible waste of an absurd sport ๐Ÿช“

24.02.2026 00:12 โ€” ๐Ÿ‘ 2    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

Thanks for sharing @jeffcolgan.bsky.social, inspired by your work. Delighted to see this article out in the world, hopefully the start of more to come on a topic that is a major factor shaping the future of geopolitics.

22.02.2026 23:27 โ€” ๐Ÿ‘ 5    ๐Ÿ” 1    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0
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Maybe Iran is considering the mountain of evidence that making a deal with Trump is a bad idea? ๐Ÿค”

22.02.2026 22:47 โ€” ๐Ÿ‘ 10    ๐Ÿ” 1    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

Nooooooooooooooo

22.02.2026 15:54 โ€” ๐Ÿ‘ 4    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0
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๐Ÿ‡จ๐Ÿ‡ฆ๐Ÿ‡บ๐Ÿ‡ธ #nailbiter

22.02.2026 15:48 โ€” ๐Ÿ‘ 2    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

"Sounding like"??

22.02.2026 15:46 โ€” ๐Ÿ‘ 2    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0
Preview
SCOTUS Strikes Down Trumpโ€™s Tariffs, Failing to Solve Any Problems and Creating New Ones The Supreme Court expanded the โ€œmajor questionsโ€ doctrine to strike down Trumpโ€™s tariffs, signaling broader limits on executive power.

NEW from me @rooseveltinstitute.org:

SCOTUS Strikes Down Trumpโ€™s Tariffs, Failing to Solve Any Problems and Creating New Ones

Quick Thread๐Ÿงต
rooseveltinstitute.org/blog/scotus-...

20.02.2026 21:46 โ€” ๐Ÿ‘ 35    ๐Ÿ” 24    ๐Ÿ’ฌ 2    ๐Ÿ“Œ 3

The best possible kind of โ€ฆ

21.02.2026 23:38 โ€” ๐Ÿ‘ 45    ๐Ÿ” 12    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 1

The National Science Foundationโ€™s entire budget is $10 billion.

21.02.2026 18:02 โ€” ๐Ÿ‘ 932    ๐Ÿ” 377    ๐Ÿ’ฌ 11    ๐Ÿ“Œ 9

It is shocking how quickly one of the biggest benefits of U.S. higher education, the ability to recruit the best students from around the world, is eroding.

21.02.2026 02:34 โ€” ๐Ÿ‘ 136    ๐Ÿ” 69    ๐Ÿ’ฌ 11    ๐Ÿ“Œ 4
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Eve of Disruption: Decarbonisation and the Changing Salience of Oil in Petrostate Conflicts As the world transitions away from oil, the future for petrostates is uncertain. This article makes two arguments: first, petrostates may become aggressive in existing conflicts to take advantage o...

Interesting new article on how decarbonization driven by climate change affects petro-aggression by @sascha-nanlohy.bsky.social

www.tandfonline.com/doi/full/10....

21.02.2026 16:58 โ€” ๐Ÿ‘ 13    ๐Ÿ” 5    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 1

๐Ÿ‡จ๐Ÿ‡ฆ๐Ÿ‡บ๐Ÿ‡ธ๐Ÿ‘‡๐Ÿ‘‡๐Ÿ’ฏ

20.02.2026 23:19 โ€” ๐Ÿ‘ 64    ๐Ÿ” 7    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

Just a loaded gun for the next time more Epstein files appear ...

19.02.2026 01:50 โ€” ๐Ÿ‘ 9    ๐Ÿ” 4    ๐Ÿ’ฌ 3    ๐Ÿ“Œ 0

Petro-imperialism. ๐Ÿ›ข๏ธ๐Ÿ‡บ๐Ÿ‡ธ๐Ÿคฎ

17.02.2026 22:51 โ€” ๐Ÿ‘ 2    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0

Thread from @fgenovese.bsky.social on the tensions related to "climate realism." See her and @jeffcolgan.bsky.social's essay for more:

www.cambridge.org/core/journal...

17.02.2026 15:22 โ€” ๐Ÿ‘ 7    ๐Ÿ” 4    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0
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Gabriel Zucman on the shocking concentration of extreme wealth in the United Statesโ€ฆ.
gzucman.substack.com?r=nle0&utm_c...

19.01.2026 09:40 โ€” ๐Ÿ‘ 802    ๐Ÿ” 387    ๐Ÿ’ฌ 20    ๐Ÿ“Œ 70
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Ottawaโ€™s shift away from US defence manufacturers aims to create 125,000 jobs โ€˜Buy Canadianโ€™ strategy will raise military spending to 5 per cent of GDP and boost economy, new plan says

These are mostly US jobs being sent north of the border, Mr. Trump. ๐Ÿ‡บ๐Ÿ‡ธ๐Ÿ‡จ๐Ÿ‡ฆ

Ottawaโ€™s shift away from US defence manufacturers aims to create 125,000 jobs

www.ft.com/content/cde7...

15.02.2026 18:28 โ€” ๐Ÿ‘ 4    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0
A capture of Manhattan facing downtown ward, with an incoming sunset with a navy blue opaque rectangular box and white text overlay that reads: โ€œAfter just one year of implementation, New York Cityโ€™s congestion pricing policy is already improving air quality in the city and in parts of New Jersey.โ€ Besides the image and the text, in the top right corner lies the YPCCC logo, which is circular, with a hollow center, and a band of 5 colors.

A capture of Manhattan facing downtown ward, with an incoming sunset with a navy blue opaque rectangular box and white text overlay that reads: โ€œAfter just one year of implementation, New York Cityโ€™s congestion pricing policy is already improving air quality in the city and in parts of New Jersey.โ€ Besides the image and the text, in the top right corner lies the YPCCC logo, which is circular, with a hollow center, and a band of 5 colors.

New York City has recorded a 22% reduction in particulate matter, a dangerous pollutant, indicating that the cityโ€™s congestion pricing policy may be improving air quality across the city. insideclimatenews.org/news/0302202...

15.02.2026 18:00 โ€” ๐Ÿ‘ 10    ๐Ÿ” 5    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0
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Happy birthday to one of my favourite haters, Charles Darwin

12.02.2026 16:31 โ€” ๐Ÿ‘ 10317    ๐Ÿ” 3072    ๐Ÿ’ฌ 162    ๐Ÿ“Œ 419
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Exxon knew. ๐ŸŒŽ๐Ÿ›ข๏ธ๐Ÿฅบ

11.02.2026 13:56 โ€” ๐Ÿ‘ 7    ๐Ÿ” 2    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0
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2026 in a nutshell

08.02.2026 19:46 โ€” ๐Ÿ‘ 6    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

The Soviet People's Republic of Florida

08.02.2026 18:08 โ€” ๐Ÿ‘ 5    ๐Ÿ” 1    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

Make The Onion Parody Again

07.02.2026 19:12 โ€” ๐Ÿ‘ 25    ๐Ÿ” 8    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0
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Carney Stakes Canadaโ€™s Auto Future on E.V.s as It Pulls Away From the U.S.

For decades, Canada integrated into US supply chains for car manufacturing so both could compete globally. As Trump raises tariffs and doubles down on inefficient gasoline-powered cars --> Canada builds its own EV industry, looks to trade globally, and US firms lose a market.

Is this winning, ๐Ÿ‡บ๐Ÿ‡ธ??

05.02.2026 21:04 โ€” ๐Ÿ‘ 6    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0
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Is the US posing a hidden risk in the Westโ€™s critical minerals strategy? The Trump administrationโ€™s recent official guidance on supply chain vulnerabilities related to critical minerals reached a striking conclusion. US policymakers are acknowledging that the United States...

The US seeks price floors with allies to build ex-China mineral supply chains.

If US allies and trading partners start pricing US political risk alongside Chinese leverage, Western minerals coordination will get much harder to sustain.

My latest at @piie.com.

www.piie.com/blogs/realti...

05.02.2026 17:26 โ€” ๐Ÿ‘ 24    ๐Ÿ” 10    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 4
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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...

"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/...

04.02.2026 02:21 โ€” ๐Ÿ‘ 40    ๐Ÿ” 17    ๐Ÿ’ฌ 4    ๐Ÿ“Œ 2

I just used the example of Harvard at a roundtable on international relations at this moment--that Trump sucks at coercive diplomacy as he can't accept yes as an answer. He is always asking for more.

03.02.2026 13:06 โ€” ๐Ÿ‘ 15    ๐Ÿ” 5    ๐Ÿ’ฌ 2    ๐Ÿ“Œ 0
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Driving decarbonization? Corporate responses to the Paris climate agreement in the global automotive sector Did firms accelerate decarbonization as a result of the 2015 Paris Agreement, particularly in industries where low-carbon options were technologicallyโ€ฆ

New publication out by CSL Director @jeffcolgan.bsky.social! Check it out to learn more about whether the 2015 Paris Agreement shifted corporate strategy in the automotive sector:
www.sciencedirect.com/science/arti...

02.02.2026 16:53 โ€” ๐Ÿ‘ 3    ๐Ÿ” 2    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 1
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A Wonkish Note on Tariffs and Inflation There isnโ€™t really a puzzle here

An experiment: A wonkish post that isn't emailed out to subscribers

paulkrugman.substack.com/p/a-wonkish-...

01.02.2026 10:56 โ€” ๐Ÿ‘ 589    ๐Ÿ” 105    ๐Ÿ’ฌ 31    ๐Ÿ“Œ 8

for us Americans, that's 98ยฐF at night and 120ยฐF in the day

31.01.2026 11:53 โ€” ๐Ÿ‘ 48    ๐Ÿ” 26    ๐Ÿ’ฌ 2    ๐Ÿ“Œ 2

@jeffcolgan is following 20 prominent accounts