Jón Sch. Thorsteinss

[Jón Sch. Thorsteinss @jst_arev]

The model runs 50 years of active open-net-pen farming, then 50 more years with zero escapes. Result: hybrid+farmed fish hit 100% of the spawning stock by year 55 — just 5 years after the last escape — and stay there through year 100. Pure wild fish never come back. https://t.co/KcDty25R88

[Jón Sch. Thorsteinss @jst_arev]

In a small river, it could take more than 50 years without any farming for wild salmon to return — if they return at all.

New IBSEM modelling by Arev for Hrútafjarðará 🧬

[Jón Sch. Thorsteinss @jst_arev]

This matters for every river near a salmon farm.

Full analysis: https://t.co/ji0Ue4sXgL

#WildSalmon #SalmonFarming #GeneticIntrogression #Iceland #Aquaculture

[Jón Sch. Thorsteinss @jst_arev]

Sea-cage salmon farming can leave a genetic legacy lasting decades — even after the cages are gone.

New IBSEM modelling by Arev for two Icelandic rivers 🧵

[Jón Sch. Thorsteinss @jst_arev]

In Hofsá in Iceland, hybrid salmon (wild × farmed) can reach 25–30% of the population — and stay at that level for ~50 years after farming stops.

The genetic effects outlast the farming itself.

[BBC London @BBCLondonNews]

The pedestrianisation of Oxford Street has been given official final approval by London's mayor, Sir Sadiq Khan.

➡️ https://t.co/kH36LCJyZo

[Andy Boenau @Boenau]

In the late 80s, San Francisco's Embarcadero Freeway carried 100,000 vehicles per day as a sort of traffic sewer, blocking the city from the expansive waterfront.

But in 1989, the Loma Prieta earthquake rocked the freeway beyond repair.

The results...

The local streets absorbed the traffic, transit ridership shot up, housing soared, new jobs opened, and various redevelopment projects transformed the waterfront.

Think about that.

After part of a downtown freeway collapsed, the area began to thrive and turned into a highly sought after destination.

[Sadiq Khan @SadiqKhan]

Proof that cycling in London is for everyone.

Even sumo champions. 🥋🚲

[Matthijs Pontier, PhD 🏴‍☠️ Piratenpartij @Matthijs85]

In Parijs +240% fietsen binnen 5 jaar (2018-2023) door veilige fietspaden, fietsparkeerplaatsen en veilige weginrichting
~@fietsprofessor🚴‍♀️#fiets

Goed beleid werkt! 😃👌 https://t.co/NU6ekbnYtl

[Alfonso Vélez 🚶🏻‍♂️🚲🌳 @avelezig]

1980 One more lane will fix it!
1990 One more lane will fix it!
2000 One more lane will fix it!
2010 One more lane will fix it!
2020 One more lane will fix it!
2025 One more lane will fix it!

Mean while, 🚲🚌🚎🚈🚇🚄 still waiting.

[Jón Sch. Thorsteinss @jst_arev]

https://t.co/orcIbTBeL8

[Urban Cycling Institute 🚲  @fietsprofessor]

'🙏Thank you for [...] traveling together'
— @vasttrafik

[Urban Cycling Institute 🚲  @fietsprofessor]

Everyone says they care about road safety.
#Helsinki 🇫🇮 shows what that actually looks like.

Protecting children isn’t about words—it’s about design.

This is how you do it.
The rest is noise.

[Urban Cycling Institute 🚲  @fietsprofessor]

Electric or autonomous cars are not invented to save our cities, society or the world.

They are invented to save the car industry.

(🖼️ via @CompletedStreet & @PlanningPeeps)

[Massimo @Rainmaker1973]

Paris has removed the paving from its city hall square and transformed it into an urban forest.

[Yeah But Cyclists @but_cyclists]

A group of entitled cyclists, riding in the middle of the road, force a motorist to perform a dangerous overtake which results in a collision.
https://t.co/Rx5OY5F4Vp

[Hayden @the_transit_guy]

Imagine thinking a block of on street parking is more important than this? https://t.co/MeBOdU3G1V

[Stefán Hrafn Hagalín @StefanHagalin]

Ímyndið ykkur hvílíkar gersemar felast í fólki eins og Ingva og Halla Halls hjá Þrótti, sem alla ævi hafa æft, spilað, unnið og þjálfað fyrir sama klúbbinn. Ómetanlegur rauður þráður gegnum áratugina. Það er skylda okkar hinna að bera þessa snillinga á gullstól um allt. #lifi

[Andy Boenau @Boenau]

Roundabouts are safer for all road users because they (1) reduce the number of conflict points, and (2) slow down the cars.

🖼️ by Smart City Memphis

[Massimo @Rainmaker1973]

Paris pollution after they added bike lanes and restricted cars