Personally, I'd like to see technology advance to the point that female babies could be temporarily sterilized at birth and then unsterilized after the age of 18 given they meet certain minimal requirements such as being able to care for a child, support a child, etc... That technology would all but eliminate unwanted pregnancy, teen pregnancy, fatherless children, and abortion. But such a proposal would be killed immediately, probably get overturned in the court system, and label me as a "Nazi-esque" person that wants to create some kind of weird utopian society.
Where you're slightly incorrect is that most modernized countries have the opposite problem of over-crowding. Most secular, modern countries in Europe and parts of Asia are struggling to get their birth rates up because their populations are dwindling. The incentive to produce offspring isn't there and the ways to avoid pregnancy are so successful that most people pass on it.
Unfortunately, and I'll probably get heat for this comment from the 1-2 female members of the community...but women make the problem worse because they are generally unrealistic by nature...especially in California. As I am now in my 40s and dating...my pool of women (not quite a binder full of women per se) are mostly in their 40s. And you would be SHOCKED at how many women 39-45 are very interested in "starting a family". In other words, they put off a family for 4 decades...and are now at the point where it's more dangerous to and far less likely they can conceive...but they read about a 55-yr old woman in Utah that just gave birth (National Enquirer) and spend their evenings watching Kate + 8...and all common sense goes out the window. And I blame "Sex in the City"...because a LOT of these women grew up watching that show and pretty much learning that the 20s and 30s are for wild fun and career building and shoe collecting and drinking wine and traveling to places to take selfies....then they hit 40 and it's like the car engine light suddenly lights up and suddenly "they're ready"...granted a decade late...and exponentially less likely to conceive...with a far, far greater likelihood of birth defects, Down Syndrome, miscarriage, etc... but ladies think differently...and most often...not in the most logical way. If they did, the Bravo network would cease to exist.
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