The growth of human population is around 75 million every year and is expected to keep growing. There have been different opinions on whether it will continue to grow or it will saturate after some time. The growth rate has seen quite a decrease in different regions of the globe in recent years.
Many of the current environmental issues can be attributed to the population growth as with more and more people on earth; the renewable resources are diminishing faster. However what causes this explosion in population?
Before delving further into the population growth, let us first understand what exponential growth means and how it differs from the linear growth.
We often consider growth as a linear factor where a constant amount gets added to the existing amount over some time. In this growth process, there is no influence of the existing number on the new addition.
This is not the case with the exponential growth though. In the case of exponential growth, the increase in number is proportional and related to the existing amount. Multiple factors govern the growth in population, and hence it is not just an increase in number or doubling of the existing amount. There are factors like fertility rates, mortality rates, etc. which have a bearing on the population figures.