There are six billion people on earth presently, and the figure is expected to rise to nine billion by 2050.
If this growth rate in population continues there are going to be tremendous problems like traffic jams and driving through crowded streets, people struck by hunger as the resources are limited, so on and so forth.
The twenty first century has started with this serious problem, which is one of the biggest today. It is a major crisis and is having negative impact on standards of living of the people, resources and environment.
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