But the environmental impact of flying is a drop in the ocean compared with people having even one DC. I'm childfree. If I never flew again but had a child, my carbon footprint would increase by about 10-20 times
I don't equate having a child with flying abroad on holiday. They are not the same at all to me.
There are groups of young people who are afraid to have children and they campaign for action on climate change as they see this fear of being able to have children as an infringement of their rights.
People not being able to go off on an AI beach holiday several times a year, as some people do, is not a tenth or twentieth of the pain that being unable to have the children who you otherwise would love to have.
Different if you were pretty ambivalent about the whole idea of having a baby as I know a lot of people are. This is another area which I think needs more discussion. In times gone by, if you said you didn't want children, people would say "ah wait till you're older" etc. It wasn't seen as a valid choice. If all the people who didn't really want children, didn't have them and if nobody pressured them into changing their minds, I think we would see fewer births in this country.
I definitely don't think the pyramid scheme you mention (and yes, that's the perfect term for it) should continue. Ideally, imo, we need people not to live on into very old age, when they are miserable anyway (not that every old person is, but the ones who are), being kept alive against their will by a drugs cocktail and interventions, having fewer babies in general.
I really think that when people say no babies should be born at all anymore in the UK, that is incredibly short sighted in terms of international relations, the economy and the survival of as many public services as we can reasonably sustain.
Great if we all just pootled along till we were 70, having a lovely time and then died, but that isn't how it works sadly.