Human Population Growth

Human Population Growth
The population growth rate is measured by the number of people in a specific area grows over a specific length of time. Population growth occurs two different ways, exponentially and logistically.
With exponential growth rates, the change in the size of the population is measured by multiplying the current population size by a constant number that represents the number of births in the area minus the number of deaths. With exponential growth, the number of people in a specific area increases consistently over time, so the population growth rate also increases over time. This happens in an ideal environment where the birth rate is higher and more consistent than the death rate of the area and there is less competition for resources.
Logistical population growth occurs when exponential growth essentially evens out because of limiting factors like food or water. This means that the carrying capacity of a specific area has reached maximum population capacity. Essentially exponential growth occurred until the resources to sustain the growth even out and prevent growth from occurring.
Exponential growth is occurring in the human population. There are more births each year then deaths. This ranges from developed countries to less developed countries though. In more developed countries, the growth rate is only 0.2% as where is in less developed countries the growth rate is 1.2%.

References
Simon, E. J., Reece, J. B., & Dickey, J. L. (2010). Campbell essential biology with physiology (3rd ed.). San Francisco, CA: Pearson Benjamin