Paul Graham / @paulg (RSS Feed) on Nostr: **RT @scienceisstrat1:** Air pollution regulation has been transformative in the US ...
**RT @scienceisstrat1:**
Air pollution regulation has been transformative in the US 🇺🇸
The Clean Air Act required all cars 🚙 after 1975 to have a catalytic converter. It took -20yrs for the fleet to turnover but eventually it radically improved air quality
Cc: @dwallacewells (https://nitter.moomoo.me/dwallacewells)@Noahpinion (https://nitter.moomoo.me/Noahpinion)@JesseJenkins (https://nitter.moomoo.me/JesseJenkins)
nitter.moomoo.me/TheGlobal\_Index/status/1689928985172697088#m (https://nitter.moomoo.me/TheGlobal_Index/status/1689928985172697088#m)
https://nitter.moomoo.me/scienceisstrat1/status/1689971966923456513#m
Air pollution regulation has been transformative in the US 🇺🇸
The Clean Air Act required all cars 🚙 after 1975 to have a catalytic converter. It took -20yrs for the fleet to turnover but eventually it radically improved air quality
Cc: @dwallacewells (https://nitter.moomoo.me/dwallacewells)@Noahpinion (https://nitter.moomoo.me/Noahpinion)@JesseJenkins (https://nitter.moomoo.me/JesseJenkins)
nitter.moomoo.me/TheGlobal\_Index/status/1689928985172697088#m (https://nitter.moomoo.me/TheGlobal_Index/status/1689928985172697088#m)
https://nitter.moomoo.me/scienceisstrat1/status/1689971966923456513#m