"Every Sperm Is Sacred" - or so they say

Using information from a 2006 piece by Jeremy Rifkin The Risks of Too Much City:

Two hundred years ago, the average person on Earth might meet 200 to 300 people in a lifetime. Today a resident of New York City can live and work among 220,000 people within a 10-minute radius of his home or office in midtown Manhattan.

Only one city in all of history -- ancient Rome -- boasted a population of more than a million before the 19th century. London became the first modern city with a population over 1 million in 1820. Today 414 cities boast populations of a million or more, and there's no end in sight."
(Background of illustration from: Cry of the Masses by Josef Vachal)

Keeping well away from political/religious viewpoints, especially from current arguments about contraception, and concentrating only on astrology, a few thoughts on what changes could become noticeable at some point in the future as a result of unchecked population explosion.

A few thoughts:

a) There will be more people on Earth who have identical, or similar birth charts than ever before in human history. Of course, their similarities will be stretched into wide variation due to ethnicity, locality, background, and other factors, but basic character traits could survive externalities. In densely populated areas such as New York, place of birth being closely similar too, the effect could be more extreme.

b) There will be more people born every second, and nano-second, tiny fragments of time, with minutely different alignments of planets and points. In the distant past, even in the more recent past or present history births might not have taken place in these microscopically tiny segments of time. Whether this would bring forth elements of human nature not before experienced, with previously unimagined abilities or traits, for good or ill, isn't clear, but it is a possibility.

c) Gradually increasing numbers of people born within each generation will mean that the outer planets, Uranus, Neptune, Pluto, known as "generational planets" will reflect generational traits over a broader swath of the population, resulting in more noticeable generational differences in temperament than in the past or present.

d)Greater weight of positive/negative polarities could cause public opinion to appear ever more polarised.

There are bound to be other potentialities..... some considerably more sinister.

"Which is the greater danger - nuclear warfare or the population explosion? The latter absolutely! To bring about nuclear war, someone has to DO something; someone has to press a button. To bring about destruction by overcrowding, mass starvation, anarchy, the destruction of our most cherished values-there is no need to do anything. We need only do nothing except what comes naturally - and breed. And how easy it is to do nothing."
~ Isaac Asimov

See also further, non-astrological, issues relating to overpopulation presented interestingly by Roedy Green in an article here, at mindprod.com