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This concept demonstrates its practical usefulness when observed that populations with capacity growth tend to occur in many species, a sigmoidal growth asymptotically approaches a value that was defined as capacity (Odum, Fundamentals of Ecology, 1953). The growth of a population (d N / dt) limited by its capacity (K) follows a sigmoid curve, which is proportional to its maximum growth rate (r) by the population size N and a factor is less the closer N to K.Another more modern working definition is that the capacity of a population is the size of the population (N) when its growth rate (r) becomes zero and stops growing (Molles, Ecology: Concepts and Applications, 2012). The carrying capacity is not a static value as shown in Fig.
The factors leading to an increase in human carrying capacity are essentially : Historically the global carrying capacity of humanity has experienced a gradual increase, although there have been local collapses because the positive factors have predominated over the negative .Although efforts to limit population growth in some countries like India or China, today these efforts have been abandoned or are abandoning were made in the second half of the twentieth century, mainly due to the pace of population growth is declining alone globally.As in all matters based on the laws of nature, we can use science to analyze the problem of the human population.The question therefore is not to analyze whether the Earth is able to support 10 billion people, as it most likely can, but if it can do it indefinitely. The capacity of an environment to support a species is called carrying capacity.In the context of ecology, the carrying capacity (K) is a theoretical concept, which represents the maximum number of individuals of a species that is capable of supporting ecosystem .
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For very rational to presume to be, we are still animals and not very rational forget.