I think we can have disagreements without calling each other liars.
It's not a disagreement. You made a false statement, I called it out.
I disagree!
Yes, we saw this over covid lockdowns where the massively reduced number of cars on the road resulted in a dramatic improvement in air quality around cities. If enough individuals start taking the bus or cycling in we can definitely improve our local environment, regardless of the minuscule effect on a global scale.