Reducing dependency on cars and preventing climate disaster are objective goods.
I’ve talked to a lot of climate deniers (unfortunately). These people may be saying and doing ignorant things but largely they are not stupid. They know when you make unfalsifiable claims, and that becomes part of their justification to ignore you.
Folks in these situations think the idea of not using a car to get around is crazy, because in some ways it is. It’s not the majority of people though. In the US the majority of people, 70%, live within 2 miles of all their basic needs. That’s the distance that more than 25% of people living in Denmark choose to ride a bike for an errand rather than drive.
https://www.visitdenmark.com/press/latest-news/facts-and-fig...