Why are humans overpopulating this planet ?

Answer 1

Here are a few reasons I can think of: We lack a natural predator. We have overcome many of the economic limiters that used to keep our numbers in check. Rather than being required to adapt to our environment we have become adept at inhabiting areas that formerly were unfit for occupation.

Population is controlled one of two ways. Either a limitation is placed on its ability or willingness to reproduce or else an outside factor acts to reduce the total number already born.

So, population can be controlled via contraceptives. Unfortunately, due to superstition, lack of resources, religion and a number of social and economic factors, this isn't as widespread. That's especially the case in impoverished areas that need it most.

The other control on the population comes in the form of disease and natural disasters. The parasites that infect us evolve very quickly, so although we have made incredible medical advancement we have not completely eradicated many diseases. Natural disasters such as hurricanes, tornadoes, earthquakes and tsunamis have always been a fact of life on earth, but with the overcrowding of danger zones an event that would have killed hundreds now kills thousands.

That's my semi-scientific answer.

Answer 2

It is because medical advances prevent deaths, and more people are being born every second. The birth rate is higher than the death rate, while in a balanced ecosystem, the birth rate is equal to the death rate.

Answer 3

Biologically this is not a relevant question. Right now the combination of our intellegence and and social behaviors are allowing us to be in "exponential growth" mode. One day we will have to hit the peak and level off. Then comes the ethical questions...

Answer 4

Because they don't use enough birth control.