Critical thinking capable people are more likely to work for an ad-corporation whose only side effect is to increase consumption and therefore increase emissions.
I agree, but at least we can discourage people from saying things like, "Russia is doomed because of demographic collapse," when we are just guessing about the effects of a slow down of the birth rate on the economy of a country long term.
Encouraging a small minority of HN users to not have an additional child won't move the needle.
It'll likely just remove a person capable of some level of critical thinking from the population pool.