Hmm… so are you suggesting that all women are sterilised before puberty? Do you think we should impose a one child only policy?
Women generally have fewer children and have them later in life if they have access to education, contraception, and self determination!
The birth rate in the UK is below replacement level, which poses problems for the future as pensions are paid for by current workers, with an increasingly ageing population, you have to raise taxes on the working population to cover pensions and the ongoing costs to the NHS are caring for an aging population.
To manage this you can encourage immigration of working age people to contribute to tax receipts and spread the burden of an ageing population across more taxpayers, or you can impoverish pensioners and keep raising the retirement age to prevent raising taxes. (So more people die before receiving their pensions, and receive it for less time.
The pension age for me is already 68, which is older than either of my parents lived for, and it stagnates job opportunities for younger people.
China has reversed their one child policy for these reasons, and let’s not forget how horrendous things were for families who broke the one child rule and the impact that it has on their economy.
Carbon footprint and resource use varies greatly from family to family, and is very much linked to disposable income. A person with no children could easily use more carbon and resources than a family of five if they eat a diet rich in beef, take lots of long haul flights, drive a high emission car, live in an energy inefficient house etc….