True point, overpopulation and longer life-expectancy is also a concern in the competitive nature of this world that has limited resources for everyone.
Although another concern is an ageing population where there's more older people than younger people of a working age. The vast majority of people who live in London are statistically reported as being under 30 years old - but in other places that have very long life-spans (such as in Japan where people are living past 100,) they have a problem of an ageing population.
India and China both have massive populations of over 1.2 billion people each! I think the one child per family law in China is a good idea there and should also be applied to India. Contraception should be made more available to people there too.
But what would happen if somebody gives birth to twins, triplets, quadruplets, etc, or breaks the law and accidentally becomes pregnant more than once? Would a one child law being imposed on people lead to a rise in abortions to avoid being imprisoned or fined..? What should happen in the cases of the victims of rape who become pregnant?
If a natural disaster such as a flood or an earthquake happened, or some war broke-out over oil and resources, and millions of people in a population died as a result, then shouldn't people be allowed to create more children to restabilise a population?
I saw news reports a few years ago regarding thousands of dead Chinese female babies who were found in sewers and who were drowned in rivers, as many families in China preferred to have a son instead of a girl since males are more prized in their culture. The report stated that as a result of all the murdered female babies in China in the past, there's now a shortage of females in China in their predominantly male population, and so wealthy Chinese men are seeking to find a female partner in other nations.
During the Victorian Era when the population doubled in England, people were living in overcrammed and small homes shared with many other tenants as a result of overpopulation outweighting the available housing. Today, people have to pay high parking fees and congestion charges to drive through Central London or to find an available space to park due to heavy traffic congestion on the roads as a result of overcrowding, (as evidenced on the London Underground and buses too.)
A person could argue that overbreeding is selfish (especially if the parents expect other taxpayers to fund them) - while others could also argue that not bothering to have any children at all in life and putting their social life first is selfish.
Some people love having children and may argue, 'who are others to control their human rights?' Others without any kids who are being socially pressurised to have children could also hold the same argument.
There needs to be a healthy balance between the younger and older people within a population in order to prevent economic problems, as well as a balance between the male and female ratio of a population.
Both overpopulation and underpopulation of any living species can create problems in nature.
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