Advances in modern medicine have caused a population explosion in many countries. It has caused a strain on their economies. Politically many nations are in their infancy after de-colonization and not able to cope with the manifold resulting problems.
Density of populations is unevenly spread over the globe. So is the welfare of nations. In former times when transportation was either primitive, or costly, the privileged could rest assured that people would stay at the place where they were born. Not so any more. With modern mass-transportation more and more individuals and families, dissatisfied with their poor living-standard, decide to emigrate, often desperately taking the risk of loss of money and life. Moreover organized crime has found in it a fresh way to make money by laying its hands on savings of these people.
If not plainly robbed they are smuggled illegally into countries with a higher standard of living, which in consequence become over-populated. Often they have gone on hear-say of a prosperous life awaiting them. Little do they know that, quite unprepared, a life in the lower levels of a strange society awaits them.
Some of the conflicts in welfare-societies are the result of this. Yet it is hardly recognized publicly. It is noteworthy that in countries like Holland speaking of overpopulation was considered politically incorrect. Yet, after WW2, when the country had far less inhabitants, the government subsidized emigration as it was convinced that there was no future for many of them. However, a few decades later the same government aired a plea for hospitality and a greater tolerance towards admission of foreigners.
Now that the devastating affects of this policy have come to the surface the trend is reversed again. Ironically, those who propagated immigration also expressed concern for environmental pollution, thereby overlooking that this is precisely the result of further industrialization necessary to provide labour for the new inhabitants.
Too many people herded together in a small area may show symptoms of animals in similar conditions. Diseases, psychic disorders and even suicidal attacks may decimate their numbers to an acceptable level.
Overpopulation resulting in increased demands on the environment and earth’s resources has become an issue of global concern. On the horizon clouds of problems are gathering resulting from insufficient water-supply and change of climate.