Until the concentration is high enough it affects birth rates.

Birth rates isn’t what motivates people. It’s the act that creates births that people care about. To that end, until it causes impotence.

I hate to be the bearer of bad news, but birth rates are already pretty low, and, worse than failing to deal with the problem, some people think that is a good thing.

Falling birth rates _is_ a good thing and in my view its the only viable solution to global warming. Less people is less energy use and pollution.

How can you say that? What about the economy?? Shame on you. I personally won't be happy until the global human population is well over a trillion.

With advances in genetic engineering we'll soon be able to metabolize plastics and continue growing the human population for colonizing the stars. It looks like plastic pollution is bad but it's actually good. All we need to do is CRISPR ourselves to digest plastics.

You're not allowed to say that on forums like HN because this is a place of growth and optimism. Degrowth and other such philosophical positions are considered taboo by the moderators and those with high enough "karma" to make moderation decisions.

That's not any sort of moderation factor on HN.

It might already do.

You say "vast" but we have to outlaw non-car options and legislate that only car options are allowed for nearly all our land.

If we were to even legalize non-car options, we might discover what the market actually wants. And the necessity of those laws kind of shows that the non-car option must be legally suppressed to prevent its true market preference from being revealed.

To everyone who thinks that the "vast majority" of people prefer driving, I say: show the confidence of your convictions and make it legal to build other options.

> legalize non-car options

What do you mean by that? Which non-car options are outlawed?

Dense walkable neighborhoods like you'd find in most parts of Europe.