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Quite important that the whole network effects of transport policies is factored in. We can't claim to have net-zero targets whilst simultaneously building the infrastructure that will undermine it.

Drew Pearce @[email protected] Totally agree. We’ve already slipped from 66% chance of 1.5 to 50%. Without targets is a yawning void of impetus- but the targets are becoming meaningless anyway.

Something I worry about with trying to communicate environmental cost of things, is just about any time something successfully cuts through as “gosh X is bad!”, some portion of people then think “hah, that means people are wrong to worry about Y”

My understanding is that the global carbon budgets usually cited for 1.5ºC etc are CO2 only, & we assume other forcings would fall in line with CO2. How should we compare things with substantial non-CO2 impacts (eg ✈️🐄) with CO2 budgets? Piers Forster @davidslee3

A demonstration of current UK transport policy.

Right to say the completion of the tunnel isn't the end of the story. The fight for a liveable planet continues. One way or another this tunnel will need to be repurposed: the question is how many emissions and how much money will be wasted whilst we pretend otherwise?

The same holds for the rest of the transport sector. As this recent paper in Nature makes clear: yes we need efficient EVs... but we also need to scale down the automobile industry at the same time. nature.com/articles/s4146…

Right. The tech solutions only really work if you remove any context of required speed. Cap and shift (or cut and shift) is the fastest approach which is the only speed viable at this point.

Important paper about climate risk: need to pursue every avenue of climate action to account for the various risks (overestimation of the budget or some tech not scaling as fast). Can't afford to over-rely on just one pathway in case one or many elements of it are off.

I spoke to Future Transport London for their podcast about our research on climate compatible pathways for cars in London. There's some good discussion abt how to assess transport policies with climate goals and asks can we continue to use budgets as our method of accountability

This is why we need a handle on supply whilst doing the demand work. We need a plan that encompasses no short haul flights where alternatives exist coupled with the reduction in supply of flight slots and runways.

This ⬇️. There's this illusion that we can somehow spin or frame our way out of the social & political problems of climate mitigation. I don't think we can, and many attempts at doing so are very clumsy

🚨😶‍🌫️NEW: ultrafine particle pollution from planes is threatening the health of millions of people in the UK. 😶‍🌫️🚨 Across London around 4.4 million people live within 20km of three busy airports. UFPs can be linked to the development of serious and long-term health conditions.

We’ve got a session on academic evidence for free public transport with @drewrpearce at our event on 29th September, with lots of time for comments and questions. 29th Sept, sign up here: actionnetwork.org/events/winning…

Brilliant presentations from Fare Free London's "Winning free public transport" event last Sunday are here: farefreelondon.org/posts/presenta…. Get Glasgow Moving Daniel Santini Drew Pearce @[email protected] Daniel Randall & more