My main point was the living cost. I lived in Paris center in 8m2 for 400€. And paid the navigo pass around 70€ or even more.

If you want to plan an ecological city, you don't only need to reduce cars but create affordable public transport that connect city border to its center. And the article explain badly the challenge.

Ecological planification can't bypass social and economy. I was just arguing that you can't do an ecological city if you don't reduce rent in Paris's center.

The problem Paris face is its "gentrification"

The city center is the most expensive one compared to living in rural area with a garden and few basic shop. And everything is less expensive outside Paris.

They may need to invest in dedicated transit stations and parking garages to accomplish this but IMO thats worth it to keep less cars within the city.