air pollution exacerbates asthma as well as increases the chance for new-onset asthma. So the relationship here is more complicated. Just how lack of movement feeds into obesity which feeds into less mobility.

So better not be so quick to put the cart before the horse here. A lot of people don't use cars because they're sick, they're sick because we've built unhealthy environments in the first place.

Also as far as young people are concerned, not sure I've you've ever been to the Netherlands but biking with kids is perfectly fine.