blue-shifted
Banned
TBH, for me the 'climate' argument is (almost) irrelevant in this case. As you say any global environmental benefit we gain from banning cars in Brighton city centre can easily be undone by other choices we make. What is undoubtedly true though is that banning cars, indeed banning anything with wheels, will make Brighton a MUCH more pleasant place to walk round. Will it be disastrous for the city? Well as I said on the Valley Gardens thread that well-known ultra-left wing Sussex hotbed of progressive Green Socialism, Chichester, has had a car-free centre since the 1960s and it's been fine. Ditto many ,many other towns and cities in the UK.
Try it, and if it is a colossal failure (especially without P 'n' R) then we can think again.
Think again?
We can probably anticipate a fairly large implementation cost.
We have to go balls deep, or not at all