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Human Population Growth

Essay by   •  April 8, 2012  •  Essay  •  265 Words (2 Pages)  •  1,828 Views

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Human Population Growth

One of the two types of population growths is exponential growth, increases in human population known as the exponential growth curve. This curve assumes that the population growth rate remains constant and that the population will continue to double in an increasingly shorter period. Exponential growth of a population occurs when a population has a continuous birth rate throughout time, and is unhindered by the absence of food or the abundance of disease. For example, imagine a bacterium divides in two, resulting in two bacteria. If these divide, the result is four bacteria. If these divide, the result is eight, then 16 and then 32. This exponential process will continue until resources become scarce or run out.

The other type of growth population is logistic growth. In real world situations, it is very common for populations to have restriction by a lack of food, and the presence of predators and diseases. As conditions become crowded, the population approaches the upper limit of the number of individuals the environment can support. This upper limit, referred as its "carrying capacity." Thus, in logistic growth patterns, we can expect the population to increase exponentially up to a point, and then suddenly level off as resources become scarce. In exponential equations, population growth rate does not slow down, it continues at a constant rate. In the logistic growth curve by contrast, population expectations are to level off as the growth rate approaches zero over time.

Natural ecosystems will fail to exist. Canceling out the forests, rivers, lake, and the animals that need to survive in this ecosytem.

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