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How many cars, how much they are driven and how they are driven, depend on urban development.
Urban development -> cars -> pollution
If you want less cars going around, design your cities to allow and incentivize people not to use them. See recent developments in Paris as an example:
https://www.nbcnews.com/science/environment/paris-olympics-city-reduce-air-pollution-rcna153470
I don’t think that Reddit is so much better. The interface at the moment is full of ads that make i confusing. The only thing is the community search that is a bit cumbersome, but this is due to federation, and understood. On the other hand the federation with Mastodon/Friendica/whatever is super-powerful, hand honestly enjoyable
Thank you for all your work